Talking Shit

Help me, Anonymous.  I cannot get my cousin to stop talking shit to me about every game on earth.  It starts with him thinking he's the untouchable son of god, before we even start playing anything!  Then when the actual game comes around (if it even gets that far), I whip his ass like always.  Then he'll pretend like nothing happened.

So, I want to know how to hit him where it hurts, since just beating him doesn't seem to change anything.

he probably knows he'll lose and just sucks at irony. and/or you suck at recognizing it.
or he's just a dick and you have to stick it in his pooper.