Bang his mum? Oh wait..

Bang his girlfriend/fuck buddy/best female friend
Intellectually outsmart him at everything on every level
Everytime he says something, think of a comeback. If you can't think of one, just stare at him blankly. Or just act like he doesn't exist. Like literally, act like he isn't even in the same house.

Alternatively. Play dirty. Practical jokes. Glue his phone to the table. Put itching powder in his underwear. If you wana go extreme, put laxatives in his cup of tea you make him.. then when he is on the shitter, shout in to him "Seems you have a big problem there bro, hope it wasn't from the tea I made you"