Even in idealistic settings like Star Trek, you still have divisions and unification based wholly on race. Even in the federation, one of the things people learn is how to deal with "different" races because some races are more aggressive than others or handle insults differently etc... No one tries to pretend differences between races don't exist.
Race seems to be one of those things we implicitly understand to be a cause of unification or division, yet if one considers this reality in our culture, you're immediately labelled a racist.
The conservative ideal of race neutrality, as in we can just pretend race is a social construct and treat everyone the same, is a denial of reality. The liberal ideal of all races being equal, as in any differences is due to racism, is also a denial of reality.
Can we not just accept that races exist, they are different and then adapt our society toward this?
Most Sci-fi universes understand the difference between race and values.
Star Trek Federation, zero interaction until values align, and limited interaction to maintain peace but Territories were kept separated.
Ender's Game Universe had something similar. The World Government was essentially Nationalist Countries that agreed to the Bill of Rights in order to gain the protection and trade/knowledge network.
Suburbs are often like this. They don't care about race, just want the neighborhood full of good people who also want a save environment to raise their kids.