I go to a specialized course there a person A.J. (not real name) is a bully whoever I am around batchmates he makes fun of me (saying derogatory language and swearing) people laugh at this and he get's encouragement. It's his common pattern to constantly make such fun of someone in group. I usually have ignored him and had RBF stare with no reaction but this has only encouraged him.its been like 2-3 years ,I can't take it anymore. I have to stand up for myself and fight everytime . Because of not standing up for myself nobody respects me . I have analysed his behaviour he is fragile , defensive, constantly wants other attention/ approval in group , constantly make fun of other person to feel better, don't care about what he has said to that person.

How can I stick it back to him so he never forgets this in his entire life and never bother me again. How to deal with him everytime he does like this.

I am a logical person and can't make things up to say quickly because of logical mind.( I also don't like to swear + say derogatory language like he does ) how to respond every single time + bite him back with his own words so he doesn't do it.

Also tips to dealing with such people and how to respond