It's human nature to be "racist" since people generally prefer to be with others similar to themselves. That can be multi-dimensional, ranging from values, cultures, tastes, but race is the most obvious and one of the major principal components of human experience.

Japan, Korea, and Taiwan are effectively ethnostates and they've not had the cultural enrichment yet that America or Europe has faced. Notably, there is rising anti-migrant extremism in the West, because the Great Replacement Theory is becoming increasingly obviously not just a theory.