I don't really find people's apprehension of this subject strange.
Racist stereotypes have traditionally in large part been about difference in intelligence between "races", how some were more evolved than the animalistic others, etc. (i.e. dehumanization of "others")
That's an issue, I don't think it's the issue, not be a long shot. Try being very careful and explicit about what you mean, it's not gonna help one whit, you're already on the third rail as soon as the words black, white and intelligence come out of your mouth.