Well, I have little patience for the 'drink and smoke' crowd. I'm in the same age bracket you're in, and that stuff is fine for 20 somethings, but over 40, it's juvenile.
Don't get me wrong, I'll have a drink occasionally, but not when I have to drive, go to work, play a gig, or at practice.
My band is not 100% professional or super serious, we just don't drink at practice, it wastes what little time we can spare for practices as it is.
It does sound like they feel like you're an outsider (IE: the sober one) and that tends to create some weird friction, maybe they feel guilty or something, I don't really get how that sort of logic works. Like I said, I have little patience for that. Life is too short.
And in all the bands I've been in, we all work together until the job's done, setup, teardown, whatever.
THEN it's breaktime.
Sounds like they want to party, and the band is a very convenient excuse.
As far as damage to that snake, sounds like you were set up, most likely by the DJ.