Bird hit the nail on the head. Appreciating good beer and wine, for me, came long before homebrewing. There's a difference between a connoisseur and a snob; a snob looks down his nose at others, a snob thinks he's better because of his appreciation and taste, a snob maintains serious disdain for "layman". I don't consider myself any of those things. I'll pound high life or coors light any day, and sincerely thank the person who provided it.
Now, um, grocery-store wine, I won't bother with. I don't know if anyone else is in the same boat, but...I can drink BMC no problem, but bad wine is just...really, really bad. It's not so much of a snob thing as it is a case of me not being able to drink the stuff and enjoy it in any capacity.
But, regardless, if people want to drink it, I don't begrudge them or think anything less of them for it. As Bird says, it's when you start to take the "EAC" meme seriously that it's time for a bit of self-reflection.
Working at a fine wine/beer store where we really only carry the stuff that we personally like (with the exception of a few things like Veuve Clicquot, simply because the public demands it), my outlook is something like this: there is a ton of delicious, transcendent wine and beer out there. I don't look down on people who haven't experienced it or choose not to, but I make a concerted, respectful effort to help them experience it. Case in point: last week, a girl came in with her boyfriend, and she was the stereotypical white zin drinker. She felt pretty embarrassed coming into our shop and asking for white zin, but I assured her that there's nothing embarrassing about drinking what you like. In response, she was very receptive and open, so I let her taste an awesome Alsatian Pinot Gris, which has a touch of richness and residual sugar to it. She loved it, and ended up taking a bottle home. But if I were to just dismiss her and point to the white zin in the corner, I'd have accomplished nothing.
Snobbishness is merely self-indulgence at others' expense, and I see nothing good about it.