Angry drunk friend...what to do?

I havent brought it up sober because it would just piss me off and because I don’t want to give him the impression that I’m backing down, but last night he was like,
“I took a swing at you last time you were being a smartass, do i have to do it again”

so he obviously remembers.

If I knock him one it’ll most likely go til getting broken up, because he’s a lightweight at beer and most likely won’t feel anything.