The idea that being self-centered is masculine.

(Context is a cis woman who used to identify as trans, now being anti-trans, because she regrets the effects of taking testosterone.)

This isn't something crazy, but I think it'd be right to put it here as it's a more subtle attitude I see a lot.

In most spaces, I see a lot of equating being sloppy, rude, offensive, etc., to being male- or masculine in behavior.