Why are things targeted to women and girls looked down on by men and boys so much?

Guys use “teenage girls” as an insult they’ll say that something is for “teenage girls” like that’s a factor in itself that shows poor quality. Nobody goes around insulting something for being “for boys” like I’ll say Star Wars is for boys but I’m not saying that as a factor of its quality I’m just saying I don’t want to watch a movie where the only female character gets raped by a giant slug.
Why are things targeted to women and girls looked down on by men and boys so much?
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