If I'm completely honest I believe such tendencies are part of human nature. Tribalism is part of human nature. This isn't just a European thing, it exists in Sudan between Arabs and Africans, it exists in China with the Uiyghurs. It exists in the Balkans with Croats and Serbs. It exists between religious sects such as Sunni and Shia.

It exists between countries like Britain and Germany. One of the main reasons borders exist is because it is a line between groups that eventually ended up at war with one another.

This notion that genders are identical or evveb that races are identical and humans are identical and malleable to society and culture is ridiculous. Multiculturalism is obviously causing a lot of pain even as it tries to manage itself.

We can try and learn better to live with each other but eradicating what you call unconscious bias would require robots instead of human beings im afraid.