So it's pretty fucked up.
Those dumbasses have no clue. And I'd feel the same way if a black only community did the same thing.
Maybe a Jewish community would be different. At least they all hold a common beliefs system. But all white non jews don't necessarily have anything in common. Well except in this system they all share one belief, racism.
Should they be allowed to do it? Sure, because I'd rather these types of people all be in the open, recognized and congregate together. Way better than people in hoods hiding what they really are.