Why can't white people call black people black but black people can call white people white?

I think it's because being African American is a minority compared to being white.

[[edit]] It's because white people have been the dominant race in the past and subjected other races to bad treatment so I believe if we say something to them it is seen as reminiscant of that. However, calling someone black isn't offensive because it's just a fact (although some ignorant people may incorrectly class it as racism). Unless you say it in an offensive way that implies they are below you. [[edit]]