Masculine culture has traditionally, and currently, favored conformance and lack of individuality over basically everything else. It’s one of the more toxic parts of masculinity as portrayed by the patriarchy.
There are many ways to be a woman. There are many ways to be a gay man. There’s really only one way to be a straight man, if you want to be valuable in the eyes of the patriarchy. It’s all about conformity, conformity, conformity. No deviancy, no thoughts, just a blank slate of a man ready for work, family, and an early death, be it at war or doing stupid things.