Why are there so many people now who believe there are zero differences between the brains of males and females? I'm seeing everyday normal people who you would think would know better, tell me behavioral differences between biological males and females are completely socially constructed.

Why is the world now out aggressively rejecting established science? Denial of human instincts is what every religious cult does to brainwash people.
I'm not a "nazi" or "alt right" or anything, I'm very liberal and I'm pro-lgbt. Why are people who accept science treated as nazi conspiracy theorists now?

Can I get some sources showing differences in the makeup of male vs female brains?