There Can Only Be One...

I realized I haven't posted in quite a while so I decided to post today about something I find disturbing (In my experiences). So, recently-whenever I go to shows-if there is another black girl there, I get the up down look then cold treatment. It's very strange to me because whenever I see someone of the same race at shows I always want to compulsively talk to them but then I feel awkward because its the whole 'I'm black-your black' thing that sets me back. But most recently I find other black women at shows to really dislike me or seem to at least and I can't figure out why so I boiled it down to one fact. Apparently there can only be one 'unique' black girl at a concert. I don't so much get this with black guys. I always found it strange because I feel comradery more than anything else and feel that the black female metalhead is such a small community that there needs to be some sense of unity within it-but alas-girls will be girls and we always have to compare ourselves to each other to make up some idiotic sense of self worth to feel good about ourselves. I went to a friends party where I thought I was going to be the only black person there but there was also one other black girl. I was wearing an Opeth shirt that my boyfriend had let me borrow and the girl went up to me and said she dug my shirt. I thanked her and told her it wasn't my own and that my bf had gotten it at a show and she huffed and said she hated me then walked away. I will forever be confused by that. Mind you-that was just one girl but still when I go to concerts I get the silent treatment when I smile at other black females.
Has anyone else gotten this feeling of animosity from other black girls at shows? Or is this all in my head?