Fine, I’ll elaborate:

You create a post in which you mark a list of sub genres as garbage and claim metalheads are dumb people, based on your own musical taste.

Claiming you are smarter because your taste in something is different than others is dumb and ignorant. Making fun of others for their taste is tasteless, childish and sad.

Whether or not you like metal, it can be well structured, musically complex and have highly political statements and well made lyrics. It had been an inspiration for many other musical genres. I wouldn’t call that garbage and I wouldn’t call the people listening to that stupid. It’s not my favorite genre but I don’t think I’m better because of that. I understand music and can recognize quality in music, even when it’s not my preference.