2. The Rigid Codes of Feminism/Fitting In
" You know I'm not allowed to wear hoop earrings, right?" a distressed Gretchen tells Cady, in reference to one of many ridiculous dress codes and rules of The Plastics. Gretchen goes on to tell Cady the reasoning for why she can't wear hoops, even though she likes to, is because Regina won't let her.
This is an important facet of the rigid codes of fitting in-- Regina forbids her "friend" to wear hoop earrings, most likely because she feels threatened by someone else looking better than her. A lot of the "codes" of the Plastics were fueled by low self esteem and insecurity, which obviously runs rampant in high school, when it means so much to be part of the whole, and to be liked. Because its in high school when we are still unsure of our own thoughts about ourselves, or anything for that matter, because we are still learning, so we look to others to confirm how we feel or what we're thinking. So, of course, we want others to confirm our thoughts that we are generally good people, and that we are interesting and worthwhile, but somehow, all of these qualities are judged by how good we look.
For some reason, then, we want to come off as better than others in comparison, and I think thats the basis for the girl-on-girl sabotage that was the main plot of the movie. Therefore, girls will pick other girls apart to make them feel better about themselves. The character of Regina even went as far as making Cady second guess herself, because she could tell that Cady felt pretty good about herself and had no reason to feel self conscious in the first place. For instance, towards the beginning of Mean Girls, when Regina invites Cady to sit with them at lunch, she says, "So, you're like... pretty", to which Cady, thrown off, replies, "Thanks?". Regina then shows the transparency of her compliment when she disgustedly retorts, "Oh. So you agree? You think you're pretty."
This scene is interesting because it shows how a girl can completely turn on another when she feels threatened, and in this case, Regina is trying to keep Cady down, making her rethink whether or not its okay for her to feel pretty. So, later, to fit in, Cady tears herself apart in front of the mirror when the Plastics are over at Regina's house, bonding over their perceived "flaws". There is something very wrong about that-- conforming to the beauty ideal of never being good enough in order to fit in with the popular girls.
5. Enforcing Heteroexuality
There are a lot of scenes in this movie that touch on the high school notion that being gay or bisexual is "bad", and that the traditional roles of gender are enforced. For example, in the Burn Book, Janis is condemned a "dyke", and is looked upon by the Plastics as a freak for being different. They don't even truthfully know Janis' sexual orientation, but still use the derogatory term "dyke" to make sense of her clothing choices and her disinterest in fitting in.
Even though Janis and Damien are supposedly good friends, she still constantly puts him down with anti-gay shots, such as "You're too gay to function". This is really sad, because even though they are "friends", one can see that Janis still feels the pressure to condemn gayness as wrong or as something that retards normal functioning, almost as if to say, sure you're my friend, but that doesn't mean I'm okay with your sexual orientation.
Finally, the situation between Cady and her love interest, Aaron, reinforces the gender roles of traditional heterosexual relationships. Cady, who is innately bright and good at math, decides to dumb herself down for Aaron, so as not to make him feel inferior. Because, of course, the heterosexual dynamic requires the female to be inferior to the male. The humor of the situation is that Aaron is actually really dumb, and in reality inferior to Cady as far as math skills go, so when she asks him to help her with math, her inner monologue is berating him for being wrong. Its just so ridiculous, though, that Cady would stoop beneath his skill level to "impress" him, and to get his attention. It just seems counterintuitive-- trying to woo someone by needing their help, and trying to impress them by being dumb. But she feels that thats whats expected of her, and she saw how discouraged he felt when she got A's on her tests, so she started getting D's to pump up his ego and allow him to think she needed to rely on him.
However, Ms. Nordbury did not just stand by and allow this to happen in her classroom. Tina Fey makes a great point when she talks to Cady and lets her know that she can see through the ditzy act, and she tells her that its just not worth it to degrade one's abilities just to get attention from a boy.