I get the sentiment, but it seems to me like a crutch that should be worked on getting rid of. It can't be that painful to be with other people, if it is, we need to work on ourselves and the culture. The jump from "I'm bored/uncomfortable" -> "might as well get drunk" seems wrong and a slippery slide to boot.
Human beings have been complaining about other people at social events being bores since antiquity. There is no work on oneself and the culture that will, at a societal level, make all such interactions pleasant.
Having a beer or two at a kids birthday party is a world away from getting trashed at a college party. Personally, I need a drink to loosen up and not be so uptight around casual acquaintances. I offer the same courtesy when I host birthday parties.
The kids are friends: that's why the parents are there. The parents may or may not particularly vibe with each other.
And a small amount of alcohol does take the sharp edges off social interactions with someone who might otherwise annoy you.