I don't think there's much racism out there.
What I do believe exists is TRIBALISM, race is just one way of defining who's in the tribe, and who's outside the tribe.
Tribalism was around thousands of years before racism, racism is just way of defining it, and now that textbook racism has died down, what we see is tribalism.
I believe human males are programed for it, those who try to escape it are often done in by tribalism, so it seems like tribalism is a self-selecting pathology.
Thousands of years ago places were far more homogeneous in terms of race. Therefore preference and prejudice along racial, ethinic, etc. lines wouldn't likely be as prevalent until different races began to live amongst each other.
While there is tribalism as it seems you use it as a more benign substitute for preference among like persons....abject racism in the form of bigotry and hatred is still quite pervasive ...the difference only being it's not as overt.
Over time the typically overt examples of it have been fairly rejected and marginalized. As a consequence IMO many now who may have racist tendencies but don't like the label have tended to recast or redefine their views to be less overt.