Average muppet hasn't heard about metal, and most of them probaby never will. They've only heard about mainstream metal. Average muppet would find most metal outside of the mainstream abhorrent, and the rest of it merely horrid, unpleasant and distasteful. They don't know because they wouldn't want to know. So don't you worry my friend, everything's gonna be alright, we'll still get to keep all the good shit just for ourselves. Oh, but wait a sec, that's right, I almost forgot, you're a mainstreamer!
How do you reconcile your fuck the mainstream attitude with the fact that at your core you yourself are an admitted mainstreamer? Not that there's anything wrong with being a mainstreamer mind you, I suppose in a way we need to have a mainstream for the rest of us elitist types to have something to look down on and feel superior to. But in your case, as someone who sings the praises of primarily mainstream metal bands, the vitriol being expressed toward "the mainstream" feels a bit like the pot calling the kettle black. Kinda feels like you're saying that people can only like the same mainstream metal bands that you like, otherwise they're 'muppets' (or poseurs, or subhumans, or untouchables) that shoud be scorned and ridiculed and dismissed.