Do you really think that denying that the human race is composed of biologically diverse and identifiable sub-groups will solve racism? You can call them whatever you like: races, ethnic groups, sub groups, whatever. Hell, call them banana daqueries if you like. It doesn't change the fact that, for example, any competent medical student can differentiate between Mongoloid, Negroid or Caucasians, just by examining the skulls!
True, there are many, many blends of these 'races', and the blending is growing more and more common as the years progress, and that's a good thing, both socially and genetically. But at this point in time there are still many differences, physically and genetically, between the groups.
And none of it has anything to do with racism! Racism is a strictly social and emotional issue, not a genetic one. It's an issue we must fight every day, and keep on fighting to eradicate it. But let's not try to hide the truth in politically correct statements which sound good but have no real meat to them. Are there differences between us? Absolutely, and that's a good thing. Do these differences make someone else better or worse than me? Absolutely NOT!