> Obviously many of us nerdy, introverted types grow up thinking 'girls don't dig us'
presumes heterosexual women and homosexual men are not 'nerds'. I realise that's not the intention of the sentence, but it's very easy to read it that way.
I'm a dragon-con goer. I've actually never thought that anyone not interested in what they were doing (and not getting paid for it) would be trying to fake their way in, be it an oddly dressed man or woman.
As regular street clothed people mainly interested in the video gaming track(s), my SO and I were probably thought to be the posures by many of the cos-players.