A little thought experiment:
But I like the concept of all white teams involved in a common pursuit. Like ... the U.S. military before large numbers of black people were allowed to join (my dad was a soldier back in that era).
All white organizations tend to function better than ones that mix blacks and whites. Blacks are a major distraction and a source of tension for whites. Whites are far, far easier to control and command where no blacks are present.
Throw Jews in there, too. Or gay people. Or aliens. No matter how you slice it, it's total bullshit, and offensive in the extreme.