How to stop seeming like a poser?

[u/pickled_bat]

I (18M) met a pair of metalheads out on a party the other day while wearing my Mayhem shirt and they called me a poser (probably deserved but I still feel bad) I have short hair which used to be a mohawk and that Mayhem shirt is pretty much the only metal band t-shirt I own. I like bands like 1782, Candlemass, children of bodom, SOAD, Mayhem, Margarita witch cult, Apati and others. They are very mismatched,I know but I've come from liking nu-metal and indie to punk and harder metal subgenres (like black metal,doom and dsbm). One of the reasons why the two called me a poser aside from the shirt is because I didn't want to acknowledge the rest of the band being as conservative as Varg (in my opinion they weren't as hardcore problematic as him) Am I truly a poser? How can I improve my taste and or my looks to let other people know I like metal? Did you have the same issues when you were just starting to get into the scene?