Sadly, everything creates its own reaction: the rise of a black person who contradicts all the negative stereotypes merely enrages those people for whom "white" is an important part of their identity. See also people getting angry about female Ghostbusters.
The republican party spent so long sending coded racist messages to their supporters that those supporters have forgotten that they were supposed to speak in code.
Oh come on. From the reviews leaking out it sounds like Ghostbusters is a legit shitty movie. A spoiler for the ending is out there; go read it and tell me this isn't something a 5th grader would write. No, I haven't seen it, and I probably won't, and it has nothing to do with the fact that it is a female cast, but because it doesn't sound like something, based on the trailers and previews, that I would willingly spend money on.
No one complained when the main protagonists of Star Wars VII were a woman and a black man. (Or did they? I don't know, I certainly don't remember hearing it if they did.)