Agreed...2 beers or 12. You've been pushed to your breaking point and now you're overcome with anger/rage/frustration/sadness/ARG! I get it. Been there.
As for his tactics...
"Oh it's only two beers"
"YOU'RE the one with the problem"
"You're probably screwing around with x, y and z"
"Bring it on, I can take you"
...well, these are just commonplace...so much so in fact that he's boring me. Would you mind if I yawned?
Ok, sorry. Trying to lighten the
Perhaps take some time to write things out so whenever you have a low moment of feeling sorry for him, you can re-read your words and get some resolve.
Now, what's the next step for you?