What should i do, ppl think im a poser for listening to mainstream music?

I like Afi, Flyleaf, Panic at the Disco, Billy Talent, and stuff like that, and some kids think i am a poser for listtening only to the popular bands, what should i do to prove to them that i really do like rock and im not a poser. I wear the band shirts and their like you dont even like rock u poser. so what should i do?