Avoiding sarcasm

A sarcastic attitude is quite widespread among that segment of
people who live their lives far from the Qur'an. Among ignorant
people, some may ridicule others' shortcomings, mistakes, physical
abnormalities, clothing, lack of material possessions,
carelessness, behaviour, the way they talk, and in short, almost
everything about them. To make fun of someone, they use certain
words and gestures or mimic certain facial expressions. For the
person making fun, it is not important that he may hurt the other
person's feelings, make them sad, annoyed, upset or anxious. The
important thing is to feed their own pride and to humiliate the
object of their ridicule.
In the Qur'an, Allah definitely forbids people ridiculing others:
You who believe! People should not ridicule others who may be better
than themselves; nor should any women ridicule other women who may
be better than themselves. And do not find fault with one another
or insult each other with derogatory nicknames. How evil it is to
have a name for evil conduct after coming to faith! Those people who
do not turn from it are wrongdoers. (Surat al-Hujurat: 11)
In another verse, our Lord warns, "Woe to every faultfinding
backbiter" (Surat al-Humaza: 1) and warns people who behave in this
ugly way; who do not live according to the teachings of the Qur'an
and who do not think about the account they will render in the
afterlife.
No form of ridicule is allowed among believers. Believers know that
it is our Lord Who has given to everyone their wealth, beauty,
intelligence, talents and other qualities. They take delight in the
fine qualities they see in others and, because they seek Allah's
approval and not to satisfy their own egos, they have none of the
arrogance and jealousy that characterise ignorant society. For this
reason believers are always tolerant, positive and modest towards
one another.
At the same time believers realise that the defects they see in one
another are tests from Allah. For this reason they don't call
attention to these defects, but compensate for them by acting
positively. They carefully avoid the slightest action, facial
expression or word that would suggest ridicule.