I get where they're coming from, but (in an almost self defense-type way) I have to chuckle at some goony-lookin' grad student in Starbucks who smells like onions and doesn't enjoy any more things about life than I do looking down on me for my lack of "class" because I don't do the things they do. The idea that class is ... well, about however "worldly" or whatever ridiculous metric this "urban gentry" or whatever the hell they like to call themselves ... is just kind of ridiculous. If that's "class," then it's not an enviable thing.
Being a member of a so called class on the theory that the categorization scheme has some use in separating cohorts of persons based on their values, preferences and world view, does not necessarily mean that somebody has "class," as in being person who comports themselves in an estimable way that deserves praise. But then you already knew that I'm sure.