That a observably true thing can be used to justify bad things, does not mean its untrue.

I'm quoting myself from https://news.ycombinator.com/item?id=31595298:

> People see that "men and women are different" is used as justification for prejudice (like a person not getting a chance because people of the same sex did rarely have success previously). Which sucks and people feel its unfair. And when trying to conceptualize that unfairness into words, their contra opinion sometimes ends up being "so man and women must be equal" instead of "a persons sex does not justify prejudice".