The problem with that is that people's mental images then tend to default to white, which contributes to a lack of awareness of the contributions of non-white people, alienation of minority ethnicities, and other suchlike bad things. It's a bit like the saying "I'll be post-feminist in the post-patriarchy"; ideally no-one would have to pay attention to such things, but in our current non-ideal state, it's incumbent on us to do so.