Your points are well made.

Some racists express themselves outwardly, others are more subtle by trying to force you to conform to their views based on the color of your skin.

It is one reason that mixed race couples and families face such hostility from both blacks and whites. Their existence undermines the arguments of those who benefit from identity politics.

This mixing of races, threatens the core assumptions that everyone is a racist and so your only hope is to "side with your race" rather than be treated as an individual capable of thinking for yourself. Furthermore, any progeny that mixed race couples produce are likely to view the world more individually than collectively. That is dangerous to ideologies based on collectivism... like progressive liberalism, socialism, etc.