nah dude, dont kick his ass... well you can if you want but heres what a friend of mine did in the same situation.

we got together a few guys and all pitched in to get a bunch of alcohol, we invite this guy over whos been talking huge trash about my friend. so we all get really drunk, but are kind enough to let this asshole get completely trashed. He passes out and we strip him of all his clothes, ducktape like 20 bucks to his ass and put him on a train headed north.. rofl it was the funniest thing. good thing he didnt know my name though