Honestly, I don't really care. Maybe I would if I were invested in the whole Thor comics. And I wouldn't be upset because they had the nerve to make a character black, but rather because they screwed up his appearance (totally different). As it is, I couldn't care less. I'll probably go see this movie because it does look pretty good, and I probably won't care that one guy is black in it. As long as he plays the part well, I couldn't care less.
I just have one other thing to say. We should all boycott the CCC. Just ignore them. Like any good troll they feed off your attention. And keep this in mind: Being called a racist is an insult. Even actual racists think it is an insult. So we gotta be making some progress.