Mine's the pseudo-eclectic music fan. Y'know, the one who has hundreds of albums and has heard of every band on the planet... but has no idea what he's talking about (or what you're talking about) when you mention a certain song on one of his CDs.
Tool fans are bad too, but in my experience most of the grow out of it.
I might be pretty lucky since I don't know fans of any of the choices. But I agree with PC here in a way.
I hate those music 'fans' who say they listen to everything, but really mean they listen to anything that's on. The kind of people whose favorite artists include Nickelback, Lady Gaga, and Lil Wayne.
And then there's Lil Wayne fans.....