I recognize the path you're walking, Doodle. I walked it myself a few years ago. The left keeps its members from this knowledge because it's
dangerous. Dangerous to the worldview, dangerous to compassion, dangerous to solidarity, dangerous to virtually everything the left holds dear.
They're not wrong about that. Unfortunately, their repression transforms it into forbidden fruit that people with curious minds long for. And even more unfortunately for them, there really is truth to a lot of this knowledge: In general, men care more about things and systems, women more about people. In general, people from colder parts of the world are more logical, individualistic, and have more beta tendencies, and people from warmer parts of the world are more emotional, communitarian, and have more alpha tendencies. In general, Jews are smart and neurotic. Etc.
In general. The key is to accept generalities without letting them turn into universalities that must be either accepted as gospel truth (the rightist approach), or fought against because their implications are too much to bear (the leftist approach). We have all met many, many people who defied the stereotypes associated with their gender and ethnicity.
The implications for social policy aren't as cut-and-dried as the right would have you think. It turns out that both rightist separation--not letting in too many people to assimilate--as well as leftist inclusion--treating them like members of the American family once they're here--both work. In fact, that was the model that successfully assimilated generations of immigrants and their children (such as all of my grandparents) into having strong American identities. But what we have today is the inverse: Leftist openness, with rightist xenophobia: The left lets in too many people, and then the right hates them. Boy, what a great situation.
The whole subject is a concrete exploration of the concept of boundaries. Are they absolute, or imaginary? Real but fuzzy? Somewhere frustratingly and nebulously in the middle? For further reading, I recommend
https://meaningness.com/boundaries-objects-connections and other related pages (really all of it).