The Muslim has a mission in his life, and is required to be effective, active, tolerant and social, mixing with other people and dealing with them with tolerance and in accordance with the worthy Islamic attitudes and behavior.
Allah Almighty Says (what means): "And hold fast, all of you together, to the Rope of Allah (i.e. the Quran), and be not divided among yourselves, and remember Allah's Favour on you, for you were enemies one to another but He joined your hearts together, so that, by His Grace, you became brethren (in Islamic faith), and you were on the brink of a pit of Fire, and He saved you from it…"[Quran 3:103]
Wherever the Muslim is found, he becomes a beacon of guidance, and a positive source of correction and education, through both his words and deeds.
He has a good attitude towards others and treats them well. He is of good and noble character, friendly, humble, gentle of speech and tactful. He likes others and is liked by them. By doing so, he is following the example of the Prophet 
as Anas, may Allah be pleased with him, reported that he was: "The best of people in his attitude towards others."[Al-Bukhari and Muslim]
When a quarrel intensifies, when its roots go deeper, its thorns become branches and branches increase in number, then the freshness of the fruits of faith is adversely affected. Softness, sympathy, satisfaction and peace, which are encouraged by the Islamic teachings, receive a setback.
Performance of worship loses its righteousness, while the self gets no benefit from it.
Many a time mutual quarrels perturb the persons who claim to be wise. When this happens, they take recourse to lowly and superficial things, and sometimes indulge in dangerous acts which only increase difficulties and bring troubles. When a man is displeased, his eyes become prejudiced and ignore the camel and object to gnat. Such eyes do not appreciate the beauty of the peacock, for they only see its ugly feet and claws. If a slight defect is present, it turns the molehill into a mountain. And sometimes the internal rancor and jealousy affect them so badly that no hesitation is felt in inventing imaginary stories.
Islam disapproves of all these manifestations of ill-feeling and advises to abstain from them. It declares their avoidance as the most virtuous form of worship.
The Prophet said: "Listen, may I tell you something more important than the fasting, the prayer and charity?" The people requested him to do so. He said: "To keep the mutual relationship on the right footing, because the defect in the mutual relationship is a thing which shaves a thing clean. I do not mean that it shaves the hair, but that it shaves (removes) the religion." [At-Tirmithi]
Many a time, Satan is not able to persuade wise men to worship idols, but since he is very keen on misguiding and ruining men, he manages to succeed in driving them away from Allah, so much so that these wise men become more indifferent in respecting the rights of Allah than the idolaters themselves. The best method adopted by the devil for this purpose is to sow the seeds of enmity in the hearts of the people. When this enmity develops into a fire and open hostilities result, he enjoys the scene. This fire burns man's present and future into ashes and totally destroys their relationship and virtues.
The Messenger of Allah said: "The Satan has been disappointed that he would not be worshipped in the Arabian Peninsula, but he has not been disappointed from kindling the fire of fighting among the people."[Muslim]
It means that when wickedness takes roots in the hearts, when people start hating love and brotherhood, and when these are destroyed, people then revert to cruelty and enmity, and break all those relations and links which Allah has commanded to be kept; thus spreading corruption on this earth.
In order to remedy this disease, the most wonderful thing in a quarrel is to forget it as it had never happened, because remembering it will never be a sort of pleasure, while forgetting it will never be harmless, and a good word is stronger than swords and spears.
Imaam Ibn Al-Qayyim, may Allah have mercy on him, said: "The origin of the enmity, evil and envy that occurs between people is from the following of Al-Hawaa (the lowly desire). The one who opposes his desire relieves his heart, body and limbs, putting himself to ease and thus relieves others. Abu Bakr Al-Warraak, may Allah have mercy on him, said: "When the desire prevails, the heart turns dark and when it does so, the breast becomes straitened and when that happens, the moral character deteriorates and consequently people will hate him and he will hate them. Then think of the evil, enmity, neglect of rights, etc. that arise from this mutual hatred."
Allah The Almighty forbids us from mocking people as He Says (what means): {O you who have believed, let not a people ridicule [another] people; perhaps they may be better than them}[Quran 49:11] Adh-Dhahhaak 
said,
and this verse was revealed. It was also said that this verse was revealed when Thaabit, may Allah be pleased with him, ridiculed a man because of his mother in Jaahiliyyah [pre-Islamic ignorance] and the man was disgraced. said, “Allah says here that those who believe in Him and in His Messenger should not ridicule other believers as they may be better than them. Also, women should not ridicule each other for the same reason.” added, said, “If I saw a man suckling a goat and laughed at him, I would fear that I might end up doing the same thing.” It was reported that ‘Abdullaah ibn Mas’ood, may Allah be pleased with him, said that affliction depends on what a person says. Hence, he said that if he mocked a dog, he would fear that he would be turned into a dog. said that this verse is a warning against mocking, despising or ridiculing the weak and the needy to the point that it would make us forget remembering Allah and would thus keep us far from Him. In a Hadeeth on the authority of ‘Aa’ishah, may Allah be pleased with her, she said, “I said to the Prophet ‘It is enough for you that Safiyyah is such-and-such [meaning that she was short].’ The Prophet replied:‘You have said a word that could adulterate the water of the sea if it were mixed with it.’”She also said, “I once imitated a man before him [ridiculing him] and He said:‘I would never like to imitate anyone, even if I were to get such- and-such [a reward for it].’” [Abu Daawood and At-Tirmithi], said to him:“O Abu Tharr! Did you abuse him by calling his mother bad names? You still have some characteristics of Jaahiliyyah in you.”[Al-Bukhari], said about the verse (which means): {and commit in your meetings [every] evil} [Quran 29:29] that they used to despise and mock people. [Ahmad and At-Tirmithi] to inform him of what had happened . said that calling people by offensive nicknames means calling them by names or attributes that they hate. Allah The Almighty generalized this rule and did not specify certain nicknames. It is impermissible for any Muslim to call his fellow brother by any nickname or any attribute that he hates. Allah The Almighty Says (what means): {O you who have believed, let not a people ridicule [another] people; perhaps they may be better than them.} [Quran 49:11], ridiculed Safiyyah, may Allah be pleased with her, for being short. It was also said that this verse was revealed when ‘Aa’ishah, may Allah be pleased with her, indicated by her hand to the Prophet, , that Safiyyah, may Allah be pleased with her, was short. Moreover, ‘Ikrimah and Ibn ‘Abbaas, may Allah be pleased with them, said that this verse was revealed when Safiyyah bint Huyayy, may Allah be pleased with her, said: “O Messenger of Allah! The women ridicule me and say to me, ‘O Jew...’”All these examples show that calling people by offensive nicknames is a form of mockery. They were mentioned in the verse as a way of mentioning the specific cases after the general rule in order to emphasize its importance. The scorner is the person who harms people by his tongue, while the mocker is the one who winks with his eyes. Ibn Kaysaan said that the scorner is the one who hurts others with bad words, while the mocker is the one who points to others with his eyes, his head and his eyebrows. said, “Mocking people and ridiculing them are prohibited because Allah The Almighty Says (what means): {O you who have believed, let not a people ridicule [another] people; perhaps they may be better than them} [Quran 49:11] Moreover, the Prophet prohibited this in many Hadeeths.”
