When I hear the expression 'girl gamer' it is normally said in a way that sounds shocked that there is a girl gamer since there tends to be a lot less girl gamers than boy gamers. This is not a sexist statement, it's true. I don't see how people could get insulted by this anyway, it's not like it's an insult to be told to not game. People who get out and do stuff with their lives tend to be treated more favorably than people who sit around playing games all the time. I personally am one of those people who use the 'girl gamer' term, although I try not to. It just is weird to see a girl playing a game considering every girl I know outside of the gaming world (I don't know any in the gaming world anyway) hates video games.