Simply elitism. MY metal is way more metal than YOUR baby metal. :p
I suspect it's the same everywhere. I live in Scandinavia (northern Europe) and have had very similar experiences. Best to just ignore it, and listen to what you like, and not try to force yourself like what you just... don't. Your taste in metal might evolve into something more extreme later on, or it might not.
It's good to try new things every now and then, though. (or I'd still listen to things like
Glenn Medeiros, whom I loved as a kid.. *shudder* )
Secretly, I still like hiiimmm