Maybe I just went to a weird high school, but in my experience actual school and Hollywood school are about as similar as actual people and Kanye West. Sure there were different groups of people -- there were jocks, there were nerds, there was a table of ESL kids who ate hot dogs with carrots on them -- but there wasn't a serious pathological issue with most of the school that made them seriously noteworthy in a deranged and/or comedic sort of way. Basically, what I'm saying is that real-life school is awfully different from TV and movie school, where everyone's personality is distilled to a single, terrifying character trait that, in the real world, would likely have you ostracized if not incarcerated in no time. Let's take a look at what I mean.
5 Morally Dubious Hornball
You were probably just a quivering mass of sexual stupidity in high school, but so was everyone else. For this reason, and for all the jokes anyone has ever made about hormones on family sitcoms, all films and shows about high school feature a character who, under other circumstances, would probably be a registered sex offender.
From the mostly tame advances of Xander on Buffy the Vampire Slayer to the obnoxious hepatitis dispensary that was Steve Stifler in American Pie, no high school story is complete if a decent percentage of it doesn't revolve around someone wanting to bone or someone always boning. Those are basically the two kinds of kids in high school in movies -- the sluts and the people who want to do them. Seth in Superbad actually mimes ass-licking while making a tiramisu; that kid has some preoccupation issues.
There's nothing wrong with having a sexually zealous character in a story about high school, of course. It's just that most films and TV shows push that limit beyond reasonable to "do I need to wear gloves when I touch you?" Judge Reinhold is so eager to wank in Fast Times at Ridgemont High he rubs one out on the toilet while he's dressed like a pirate. If I was having that vivid a fantasy about naked Phoebe Cates I'd probably do it on a fishing boat with my family present, but still, doesn't make it less indecent.
No movie really exemplifies the sexual misanthropy of high school better than American Pie, a film that features a teenage boy drinking semen-laced beer, another teenager fucking a pie, and a kid who has to find a secret book buried in a public library to teach him how to properly stimulate Tara Reid.
4 Unfathomable Bitch/Total Cockhole
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This is the absolute cornerstone of every single high school story ever. One character, one being, who is so unimaginably despicable that you wonder if their parents hatched them in a vat of blood warmed over a fiery pentagram in the root cellar. Why is this person such an asshole? How is it even possible that this person is such an asshole?
Mean Girls centers itself around the idea that someone at school is such a magnificent twat you're kind of in awe of her and would possibly get sucked into her douche aura and become like her as her shittiness spreads like a plague to those around her. Buffy has Cordelia, Harry Potter has Malfoy, Teen Wolf has Mick, Spider-Man has Flash, Edward Scissorhands even has Jim, who is played by former typecast nerd Anthony Michael Hall.
Movies seem to mostly be written by people who had a rough time in high school. They missed out on parties, and sometime between high school and careers in screenwriting they came to the conclusion that the reason they never went to parties was because the popular kids were two chromosomes removed from being Satan himself, and anyone who wasn't nice to them was not just kind of mean, they were awful in every way. The most popular guy in the neighborhood when Daniel LaRusso moves in is quite possibly psychotic. The Karate Kid has to learn martial arts just to not be murdered by an entire gang of Aryan thugs.
Consider your own life for a moment. Either right now, or when you were in school. Who were the most influential people you knew? Who were the cool kids in your mind? Were any of the actual popular kids at your school, or even now at a workplace, just raving, unapologetic, dick-faced shitheads? I will place some cash on that not being the case.
No doubt some popular people are assholes. There was a dude on the football team at my high school who was clearly mentally unstable and would make fun of and beat up people all the time. People were legitimately afraid of him since he was built like the Hulk and thought everything he said and did was funny. He was invited to parties because people were afraid not to invite him. But that didn't make him popular; it just made him omnipresent and terrifying. The really popular people were funny and smart and likable. They had friends who were jocks and nerds and band geeks and every other stereotype that exists in high school. Hollywood has no time for this. One dimension or bust.