I have personal experiences with these situations. For instance, there was a girl in high school on the golf team that wanted to make sure everyone knew she was the best on the team. The thing is that she wasn't even that great and there was a freshman climbing the ladder who was better than her. She'd just walk around like she was the shiznit and sometimes I wanted to walk up to and whack her with my club or hit into her on the course. Then I had the roommate from hell and she was just so annoying and mean.
When you are put in the situations as a girl there are only a few ways to deal with it. You can bottle it up and then have some little thing make it explode some day or you can brush your shoulder off. Personally, I know it is so hard to "brush ya shoulda off". The other thing is that while fighting is socially unacceptable it is even more unacceptable when girls fight. Guys get pissed, punch each other and they are better in a few days. With girls the aftermath can last a life time. Even when it's just a verbal blow up it may be years before you talk to them. That leads to an even sadder reality and that is the fact that even when we are adults we still have those urges to go crazy on that other girl, scratch her face, and rip her hair out because we can't stand her. But we can't and we won't because we are civilized and proper women who don't take part in such unruly activities.
I have to say I just love that movie b/c it goes a lil deeper than the average teeny-bopper movie. every girl in the room can relate to some character...whether a plastic or a side character. It also reminds me how sad it is that Lindsay Lohan's life/career has pretty much gone down the crapper.