i saw this list before, its from a site called stormclad, and the webmaster can be a pain in the ass to deal with. he's the typical politically correct you would encounter in tv/groceries (that actually happened to me once)/starbux (that one was obvious).
as far as his list, that was acutally a real list he meant deep down (in seriousness). although i can see where the stereotype is coming from, my experience was completely different with the metalheads i deal with. also, as a sidenote, the stormclad webmaster does listen to metal himself, although i don't know about these days.