They're an existential threat to our species so I'm totally ok with giving them their own nation as a quarantine measure. They would immediately declare war when they realize their society/economy is dysfunctional either due to global ostracization or not having access to legacy wealth accruing mechanisms created during colonial times. The question is if America would come to their rescue as they have for the worlds other "favorite" ethnostate.

Does Nazi Fascistostan have a right to exist?

So what about all the other racists? You might be shocked but lots of other countries are very racist and they're not white either.