Not sure what culture you are from, but in Poland at least I have almost never heard girls (or anyone!) say anything particularly bad of that sort to boys, but I sure have heard said a lot to girls.

There's definitely still a strong 'boyish' culture where boys can say almost anything they like and it's OK, but girls (for whatever reason) won't. It's not about who's better - it's about what we let people get away with.

Also it's not about thinking. Thinking is the ultimate change you want, but we can't see and know what people around us think, but we can still try to enact standards of reasonable, gentle (non-violent if you will) communication.