Life is too short for this kind of ********. You like to drink and get totally wasted? As long as you played a good show, and you're fit for the next...you're good...knock yourself out. I couldn't care less. I won't bang on your door in the morning, or even bother to check on you at 5PM. If you're good to go on cue, I'm happy with that.
On the other hand, if you don't drink at all, or drink very little, and feel vindictive because someone was a dick last night...please, grow a pair. Take the high road, realise they were drunk, and move on. I also used to hold a grudge when I was a kid. And then I grew up.
I drink very little or nothing at all before the show (max. 1 beer), and may have 1 beer after if I plan to stay another hour after the gig. After all I have to drive home, and I hate risks (call it "Swissness"). I have a family already in bed after my show ends, and I want to either have breakfast (or lunch) with them in the morning. I don't want to feel sick, be in a bad mood or whatever hangover wants to bring with its ugly face...so I gauge myself.
Edit: After re-reading my own post, I was reminded of this: