For me, I'm afraid, yes this is an issue. Not one to get angry about, but one first hand experience has left me somewhat exasperated of. Many attractive girls (and some guys I'm sure, but I'm yet to meet them personally) will indeed play the "fake nerd" for attention, and my reaction when they turn out to be ignorant or apathetic isn't anger, but actually kinda upset.
The implication of this behaviour is that this person perceived me, and presumably many others like me, to be slaves to sex appeal. For a lot of us, that's just patronising. We gather with the others we do because we want to share and enjoy. I'm real glad you look pretty and all, but it's not all that interesting if you have nothing to speak about, and have no genuine interest in anything going on.
I can't speak for the rest of the culture, but what I want to say is it's not that you can't be attractive or highly social and not be "one of us" so to speak. But you can't be if you have no interest in what we do. You'll get far more positive attention from us if you have something to contribute than if you just look good and pander, and everyone is happier that way.
I don't let this anger me, because it would be immature, and at the end of the day, for every girl I meet with this negative attitude, I meet one who can introduce me to new things and I can talk with. I just wish those were the only ones I'd talk to at conventions, and less of people having to have their cosplayed characters explained to them by passer-bys, and giving weird looks at people asking for photos (a sadly regular occurrence where I live seemingly). There's nothing stopping them from including themselves if they were to not blatantly look down on us.