Why is it so controversial knowadays to say that men and women on average are different?

It is seen as sexist or bigoted to say even though science backs it up studying the structure of brains. And even with medical abuse torture experiments like John money when a mutilated boy was raised a girl and was miserable. I don’t believe people are born blank slates. Sure socialization from a young age does occur and society still places stupid gender roles on individuals but part of gender is innate I believe. I Believe men and women are different but gave equal worth. And women are just as smart as men are. But also physicality wise men tend to be stronger than women due to more testosterone. And if men and women weren’t different how would we have gender identity? Male and female gender identity are neurological and hormonal. Or even other ones like non-binary may be related to hormonal factors. .