The beginning of Surah Hujurat talks about the Prophet's (S.A.W.) Rights and the etiquette to be observed when dealing with him. Ayats thereafter, in this surah mentions the Mutual Rights and Good manners as it relates to mankind and the general body of Muslims to be observed among themselves... These verses were for the collective reformation of society.
The current verse 11, "Prohibits 3 Social Evils:"
(1) Ridiculing One Another
(2) Finding Fault With One Another
(3) Reviling One Another with Nicknames.
According to Qurtubi, (Famous Classical Scholar of 671 H.), Mocking does not only mean with the tongue, but also means making pointed references to him, laughing at his words, his works, his appearance, his dress, or calling peoples attention to some of his defects, so that they may laugh at him. Mocking includes all of this. By the clear text of Qur'an, making fun of someone or ridiculing him is absolutely forbidden.
*Holy Qur'an 49:11
*Ma'ariful Qur'an ~A comprehensive commentary on the Holy Qur'an: Vol: 8 pg: 131-2~