emolitist
A combination of the words "emo" and "elitist"; it describes one who listens to emo music and regards any bands that they don't like as "trash". They tend to be indie snobs and they look down on those who don't share their taste in music
That kid is such an emolitist. He thinks that they're all posers because they didn't like the Used until after they became popular, which at point he stopped liking the Used. Now if anyone he knows doesn't like Small Brown Bike or Something Corporate, he won't even talk to them in public.