Why is it our society so blind to the concept of sex / gender differences?

There are so many "progressives" on the left who think that sex makes so little a difference in anything but sports.

Like, why isn't the fact that Norway, with its super progressive gender policies and attitudes, have a larger divide between men and women in the sciences and humanities?

Why is it so hard for a SJW to accept that there are sex and gender differences? They can accept that other races have different cultures and respect that. But they can't accept that sexes have a different life experience and accept that?

I really don't understand. /sigh