BS. The person who complained was exercising his or her white liberal outrage (privilege) and had no right to do so. He or she not only displayed an incredible amount of disrespect to Mosley's unique experiences that inform his life/right to reference whatever slur was used against him (or anyone like him), but assumed his or her outrage took center stage in a situation where the person using the slur has every right to use it (which was not directed at anyone in its negative sense). As mentioned earlier, it is this kind of arrogance, this "we know best" (which lines up with "I'm white and I say so") belief system that sees an American black man penalized, and yes, he was--long before he left the position--the moment he "dared" to speak his mind about his experiences (which the offended are forever clueless about).
Yes, because its the job of anyone--particularly the largely white, paternalistic entertainment industry to police the use of a term when used by black Americans. Yes, because they (in this case, an entertainment company) are so knowledgeable about the how, when and why black people might use or refer to the term, that they can wave their mighty hand in fair judgement...ending with some kind of penalty.
The term has been possessed/modified in large parts of the Western black culture over the past 70+ years to mean more than what others think it means, but even as a slur, it is our right to refer to it if we choose to.
You cannot possibly know how that kind of controlling treatment ("investigation" included) has affected black people (black people in America in particular) for centuries. Its not only demeaning & infuriating, but a continued form of psychological slavery, where your life, history--any part of your own identity is not your own. It has to be sanctioned by the All-Knowing, All-Caring, "we know best" masters, because after, all...they know what is best for everyone.
F-that.