Let me put it to you another way...
Imagine a world where each of us put on a gray head to toe suit each day that completely concealed our skin color. A suit that made it to where race was not identifiable.
At that point how would groups form?
Do you realize that if this went on for a long time and you suddenly had people take those suits off.
Some groups would be diverse in color.
Other groups would not be.
Why?
The decisions had nothing to do with skin color just other things. Who has the skill for the position you are seeking? Who happened to be in the right place at the right time?
Who has a character that was appealing to whatever criteria a group formed around?
"Content of their character" NOT the color of their skin, the shape of their genitalia, or whom they chose to have sexual relations with.