Not so much horrific as hilarious - that anti-racists would cheerlead segregation and purposefully exclude themselves into white/non-white categories like the KKK of old. It's a clownworld sort of irony that is stranger than fiction.
But so then what is with all your revolutionary race war cheerleading? Also sarcastic? Be plain: Are you in favor of segregation or not, and are you looking forward to a race war or not?
Why you gotta ruin a good thing?
No I'm not advocating for a racewar and no racewar is actually going to happen. As I said elsewhere, the US isn't actually as racist as other parts of the world, like Asia for instance. My own racewar cheerleading is tongue in cheek to draw corollary between the far left's racial cheerleading and the far right figures that they hate so very much. It provokes people and requires a bit of reading between the lines.
No I'm not for segregation - though it's funny to watch people drawing lines to figure out how to do so. With that being said, if one race is going to have advocates, other races will follow. Identity politics begets identity politics.

I endorse a view of metaphysics that judges people based off of their "level" of consciousness - the interconnections of their astral/ect components and the metaphysical material of those components. Very few humans pass muster.
Non-white-only spaces are absolutely no better than white-only spaces. The entire idea of not-being-a-racist is supposed to be that race is and always ought to be a fundamentally illusory and inconsequential thing. Forcing people to perpetuate the "reality" of race as a pervasive, inescapable social construct is no less fundamentally racist for being misnamed "justice" or "identity".
Progressives have regressed so far up their own ideological asses that they've rapidly become the West's premier racists, and the worst part is that they are the ones most epistemically closed to the idea that they've become their own worst enemy, blindly anointing themselves as the least blinded in a world they righteously pronounce hopelessly blinded. Ironies upon ironies upon ironies.
Every progressive/liberal NGO I've seen up close is a feudal hell ran by despotic tyrants. Academia is a stronghold of "progressives" and they love using grad students like slaves. They've become what they hate.
They're also not very effective at confronting predators that have snuck into their midst to monetize their ideology. Telling people what they want to hear is very profitable.
Edited to add: The country is fracturing along class, racial and religious lines and the center isn't holding very well. The country is extremely polarized. Race may be a factor in a hypothetical civil war but not the primary factor in it.