People can be such jerks! Don't think you're crazy or something - that guy over-stepped boundaries, especially for a support group environment. When something like that happens, like that kind of vibe directed at me, I get really upset too (plus I have acute anger issues), usually bothered for the whole day, so I hope you're taking it easy and just trying to get some R&R. Maybe he has a guilty conscience...?

In my perfect, narcissistic world inside my head, next session I would accuse him of drinking extremely sarcastically in front of everyone; but, that would be sinking to his level. You can dream right?