Epistemological: Urban "culture" rubs off on you whether you go to the opera or not, I guess? I don't entirely understand this one.

There's a whole stew of urban cultures; relatively few of them involve opera. And yes, some of the culture(s) you live in will rub off on you, though you may be more or less resistant. I'm not sure what's not to understand? Or is this a more complicated assertion than I'm taking it to be?