[yellowapple]

In that particular case, I reckon such a clause would run afoul of various regulations prohibiting discrimination against a protected class (specifically, a racial/ethnic minority). Thus, there's no "right to refuse service to black people" to reserve.

That aside, my point is that this is a very common clause for online businesses, and the existence of such a clause - again - does not mean it has to be enforced. Plenty of companies add all sorts of things to their terms of service / privacy policies / EULAs / etc. to cover all sorts of contingencies, and this seems very ordinary and mundane in that context.