I think you handled yourself well.

Sometimes you will meet individuals who simply want the violence. Obliging them might turn out well, but it sounds more like this person was going for a "double win".

You take the bait=>beat the snot out of him=>he goes to administration and pulls a "poor me" routine=>you get flayed. Or he beats the snot out of you, and you get no backing from admin; I would hazard to bet he's done it before...

So Hurray! You did not take the bait :) Often the best move when drinking.