These girls were not mean
Yes, they were superficial and catty, but mean? Not really. When I went to school, I had a weight problem and most girls left me alone, but the girls who did pick on me were what I would call mean. They would tell their boyfriends to make fun of me and would nastily ask me what I was looking at if I happened to accidentally glance their way. One would call me and my friend fat, and would hate to even have to sit by us, because she said it was the fat people's corner. Now, that is cruel. The girls in this movie did not seem to go in that direction, which is good.
"Duh. You're the idiot. Not me."