In all fairness, becoming a brewer doesn't automatically grace you with omniscient knowledge of beer. In fact, I'd say most people who brew learned to taste beer before they learned to brew, otherwise why start brewing in the first place? I know a ton of non-brewers who know their way around beer and its descriptors. People that are way better at tasting beer than you or I likely ever will be.
The problem is that we've attached this stereotype to non-brewers that says they don't know anything about beer. Is it a true stereotype? Maybe. But if you're the non-brewer who knows how to talk about beer, how would you feel if a brewer treated you like an idiot just because you're a non-brewer? That's on the same level as racism as far as how much sense it makes.* Beer is one of those things you don't have to make to understand, so you need to get off you frickin' high horse.
*I think racism and racists are fooking retarded.