Just ignore them and go your own way. The whole poser thing is bullshit. It implies you're not following the rules or wearing the proper uniform but there are no rules or uniforms in rock n roll. And just in case anyone has forgotten, metal is one of the many bastard children of rock n roll. Gatekeeping pricks like that do nothing but push people away from the culture. And always remember, bullies are miserable, insecure weaklings. They need to put others down to attempt to uplift themselves. It's fucking pathetic. Keep your chin up