Hi Ly,
There still might be idiosynchrasies in the way in which persons with various cosmetic trait colors themselves might process information about the color of others
...in ways whose analysis might reveal correlation at an embarrassing rate with persons of their own color as compared to persons with another color. In fact, we have anecdotal indications that some liberal educated folks have superstitions about colors such as
1) When all racism has disappeared, it will be because all diversity has been interbred to make a single, moderate and pleasing type of person. Hence, persons who have that appearance today are probably the best because they show the colors of "disappeared racism."
or another:
2) Socioeconomic patterns and historical events point to certain patterns in personal color. Although I believe all of them are baloney, a reasonably good case can be attempted for them.
3) Since white folks have thinner skin, they might be more sensitive, hence more subtle.