ok i'm pretty snobby about music. i tend to judge people that don't have a very broad range of taste like i do. so like people that listen to one genre only annoy me and i make fun of them.
also i have a really good ear, not perfect pitch, but the next best level right under that, so if someone's off key, in any context, i usually say something about it. like if a person changes key in the first five seconds of the national anthem (happens all the time), i will absolutely point it out to those around me.
i think i like to be snobby about these things because i generally hang out with people who know very little about music.