There’s no reason to be snooty about beer – sure, you should drink good quality beer if you like it. But a Bud Lite, for example, is just fine. Thinking poorly of a person because they’re drinking crap-beer is a waste of your time. The opposite is equally true: there’s nothing special about beer because it’s crap-beer, and you shouldn’t drink it because of brand, “life-style,” or anything else other than your enjoyment of the beer itself. Drink it because, first, you like it, and second, you can afford it.
The higher principle is: drink what you dig, and allow others to do the same.