Bad concert etiquette???

i've heard its bad concert etiquette to wear the shirt of the band that is playing at the concert you go to... im going to a music festival with like LOTS of bands so is it ok to wear one of my band T's of one of the bands that will be there? or is it bad to wear their shirt? will i look like an extreme dork or an... show more i've heard its bad concert etiquette to wear the shirt of the band that is playing at the concert you go to... im going to a music festival with like LOTS of bands so is it ok to wear one of my band T's of one of the bands that will be there?
or is it bad to wear their shirt? will i look like an extreme dork or an extreme fan?

help plz!
Update: its 4 warped tour
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