In other words, would self-hating blacks be allowed to proclaim that "blacks are inferior to whites" in a workplace setting, without consequence?

I'm not asking that rhetorically, just thinking aloud. This is legitimately interesting to me and I haven't given it much thought before now.

I think we'd have to look at the implicit idea you seem to be defending, that blacks can't be victimized by the (from a different speaker, clearly racist) expressions or epithets used by other blacks.

Or if you had a bunch of gays from one department in an office who referred to their group as "The Machinist F__gots". Could other gays feel victimized or impugned by this? Should this behavior be policed as it would from straight speakers, even without the need of an actual victim to speak up?

It's interesting. But I may be misinterpreting the issue somehow.