I for one am old enough to remember when this was widely accepted. It seems it's out of fashion now, but I remember progressive people talking about male and female brains and how transgender people are born with the opposite brain, and it's proven, and if you don't believe it youre a science denier. I find it just a little suspicious that nobody is willing to admit that they said this out loud, almost as if it was not about science at all.
This just in: new research finds differences between male and female anatomy.