I remember when I went to a Circle Jerks show a few months ago there was a girl there just standing in the back wearing a My Chemical Romance t-shirt. She didn't know any of the songs she was just standing there in the back doing nothing the only reason she went was because she had no idea that Circle Jerks are actually punk and not the same as My Chemical Romance.
Anyway people from the circle pit just kept going out of their way and flying out and hitting her and screaming 'GET THE FUCK OUT WHY THE HELL ARE YOU EVEN HERE' until she and the two guys that she was with that no joke, WENT INTO THE GIRLS BATHROOM to put on makeup before the show started finally just left.
I don't consider it mean they weren't enjoying the music anyway they were just ruining it for everyone else.
That being said I've never been a fan of My Chemical Romance, it's not that they are really that bad, it's just not my type of music.