Is talking about a Fasiq (someone flagrantly violating Islamic law) or an oppressive drunkard or one who commits Zina (sexual intercourse outside marriage) considered Ghibah (backbiting) which is Haram (prohibited)?
If your talking about such people is by way of ridicule and having fun with the attendants, this will be considered forbidden Ghibah, for this entails spreading obscene acts and making it amicable for spirits. This results in the dullness of the spirit, removing the sense of honor and prevailing evil.However, if this talk is for defining him and exposing his identity in order to let others avoid his evil, counting on his narration, accompanying, dealing or having a marital relationship with him, then this will not be Haram. (Part No. 26; Page No. 15) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.