Nor am I, to be honest. It seems to stem from a certain about of sexism (see terms: "chick-flick;" what [the horribly misogynistic] Quentin Tarantino calls "chick-vision," etc.).I will add that I'm not really a fan of "chick" as a descriptor for women.
But, if a woman doesn't mind being called a "chick," well, that's fine with me.