You don't know how someone's going to behave under the influence until you see them under the influence. So, he should allow someone to ruin his time at least once as a drunken idiot before he takes action?
As for my opinion (I don't pretend to speak for anyone else here), he can do whatever he wants as a host (prohibiting whatever he wants, accepting whoever likes that ruleset) or as a player (only playing with people that agree with his rules). I would be irritated if someone new joined our group and waged some campaign to stop us all from having a beer or lectured us on why it was bad based on some bad experience he had. We'd kick the guy out.
These days I think people have trouble agreeing to disagree. He can have his standards, I can have mine. We can both think the other's are irrational, illogical, unacceptable, uninformed or simply not desirable. That's why we don't game together. We don't always need to resolve our differences or find some way to say "Oh, that's perfectly logical" even though we disagree.
This thread has gotten a little contentious at times because the nature of the subject matter makes it very tempting and easy to go beyond "agreeing to disagree" and try to give examples or logical arguments on why the other guy's standard is too harsh/wrong/bad for gaming, whatever.
Ultimately though, I think we can all agree that the game's great because it allows us to self-select a group of people that enjoy the same things we do, no?