Allah says in Quran
“O you who believe! Let not (one) people laugh at (another) people perchance they may be better than they, nor let women(laugh) at (other) women, perchance they may be better than they; and do not find fault with your own people nor call one another by nick names.” (Surah al-Hujurāt 49:11)

In Islam exposing a believer, taunting, mocking, cheating, lying or any other act that hurts him is strictly forbidden. Quran says that Allah will always those who believes
“...And helping the believers is ever incumbent on Us.”
(Surah ar-Rūm 30:47)

Such a believer who hurt sentiments of one another, trick or played him, find his fault or bad thing in him will have painful death and is reported to be of Satan if he is not shameless for his acts
The Messenger of Allah (S) says,
“Indeed Allah has not permitted Paradise for any shameless abuser who has no qualms about saying anything or what is being said to him, because if investigation is conducted he shall be found to be illegitimately born or Satan was involved in his origin”.
People asked, ‘O Messenger of Allah, how can Shaitan get a share in their birth?”
He (S) replied, “Have you not read the words of Allah,
‘(O Satan!) Share with them in wealth and children.”
(Surah al-‘Isrā’, 17:64)

Imam Ja’far as-Sadiq (a.s.) says,
“Cursing and abusing is from cruelty and cruelty is punishable by hell.”

Even making a person angry is like making the Lord angry. In a narration we find that
The companions were very keen to remove any bad feelings from the hearts of their brothers towards them. `Aa’ith Ibn `Amr Al-Muzani reported: “Abu Sufyaan passed by Salmaan, Suhayb and Bilaal and some other Companions (after the conquest of Makkah, when he was still a disbeliever). They saidto him: "The swords of Allaah didnot exact their due from the foes of Allaah?'' Abu Bakr said to them: "Do you speak like this to the chief of the Quraysh and their master?'' Then he went to the Prophet and related this to him. He said: "O Abu Bakr! Perhaps you have angered them. If so, you have angered your Lord”. Abu Bakr rushed back to them and said: "O my brothers! Did I offend you?'' They replied: "No. May Allaah forgive you, brother”. [Muslim] One should not find faults in the believer
Imam Baqir (a.s.) and Imam Sadiq (a.s.) have said,
“The deed that brings one very close to infidelity is that a person considers someone his brother in faith but he keeps track of his defects and misdeeds so that one day he can use them to criticise the believer.”
(Al-Kāfi Vol. 2 page 354)

Abusing a believer or hurting him is a great sin in Islam and is similar to to throwing oneself in destruction. Islam promotes respect and peace
The Messenger of Allah (S) said,
“Abusing a believer is like throwing oneself into destruction.”
(Al-Kāfi Vol. 2 page 359)