People seem to have missed the point..
Okay, I'm a chick. A 27-year-old, to be precise. And yep, I've known grrls that exhibit this odd behaviour. So the film kind of fits into the "funny cos it's true" category, though of course it's a bit exaggerated and none too subtle.
However..a word of caution to guys that might take the lesson to be "chicks are all bitches, treat them like crap and they'll like you for it". Nope. Some of us know better. Just like all guys aren't like that abusive jerk she digs in the film, all chicks aren't this dumb.
My advice? Just like every other social situation in life, figure out which flavour of chick (or guy, depending on what shakes your shorts) you are dealing with. If she's *that* kind, don't give up on the whole deal--just move on to a friendlier one. Easy, eh? :]
--Jenner