Let's make a list of movies that have based themes, even if the writers and directors perhaps weren't doing that on purpose. Include spoilers if you want, but please mark them in advance.
I've got two in mind.
Appaloosa from 2007 with Viggo Mortensen and Ed Harris. A western about two lawmen for hire who come to a small western town and get hired on to take down a land baron who murdered the previous Marshal. Pretty typical setup as far as westerns go, but the movie introduces a female character about a third of the way through who is pretty realistically portrayed. She has zero action scenes, she quickly starts making moves on the senior lawman, played by Ed Harris, but also tries to get her hooks into his deputy. At some point when there is a falling out between her and Ed Harris, she accuses Viggo's character of trying to make moves on her and Ed Harris's character straight brushes it off by saying he doesn't believe her and believes Viggo because they're friends. There's no 'what if she's telling the truth' drama. She also later tries to hook up with the evil land baron character. Very based themes about the nature of women, hypergamy, positive male friendship, and the untrustworthiness of women.
Side Effects from 2013 with Jude Law, Rooney Mara, and Channing Tatum. A psychological thriller about a psychologist, Jude Law, diagnosing a windowed housewife, Rooney Mara, who murdered her husband, Tatum, and tries to plead insanity due to the supposed side effects of an anti-depressant she was on. I won't spoil the whole movie, but not everything is as it seems, and there is a sordid lesbian romance later on in the movie, where it is revealed who was lying about what and who is manipulating who. You'll be very satisfied at the end when the guilty party ends up getting what's they deserve. Also a lot of based themes about the nature of women, though I don't want to go into specifics due to spoilers.
The Ginger Weasleys are openly discriminated against by everyone, to the point they are attacked.
That one is hard to classify because you can spin it a few ways. You could say that it's "based" because Draco and the other Slytherins represent arrogant "elites" looking down on the lower class Weasleys. Or you could say it's an example of her libtard bias because she made the rich people comically evil and the poor underclass people noble and good. And, of course, anything touching on Slytherin in general has to acknowledge that a large part of the framing for the whole conflict is a cartoonishly simple anti-racism message. Remember, the Malfoys hate the Weasleys because they don't like their sympathetic attitudes towards muggles.
(You could also say that what's going on with the bullying is not really any of those things, and it's more of a satire of or reference to some British private school dynamic I'm not culturally equipped to fully understand).
Gingers are traditionally bullied ruthlessly in UK schools. They have been for more than a hundred years.
Being a ginger is a very visible sign of having Irish ancestry. There are a bunch of cultural reasons that the Irish were loud, stupid, prideful, drunks. They were always poor, always Catholic (strongly Papist) in a country where Papist plots had tried to assassinate fucking everyone important, thousands of times.
The Irish Papists were trying to blow up the common people of London in the Troubles, which didn't really end until after the World Trade Center and the New York "Irish" stopped funding their terrorist bullshit.
Private School Houses are a thing. "Old School" ties and loyalty to the fellow alumni of the "Old School" is a class marker of the upper class. Something like more than half of UK Prime Ministers were graduates from Eaton boys school.
The Weasleys are stand ins for poor Irish Catholics, and they are poor because the dad works and the mother stays home and looks after their huge family.
More traditionally, Irish drink and gamble and beat their wives, then go to Church on Sunday to worship the Pope and be sorry for what they have done.