I have no idea why we pick up on the tiny differences in human beings and pretend they are race. Maybe its a survivalist trait harking back thousands of years to when we lived in a world full of other human types like Neanderthals and 8 foot tall Homo Giganticus and 4 foot Homo Hobbititensis and felt the need to kill them off to survive. And now theres just plain old homo sapiens left

but we are still stupid enough to invent different races to satisfy our irrational hate.
Of course, when we tried to kill of Giganticus thousands of years ago, we must have let some slip through like Valuev and the Klits, but I cant see why we all couldnt still be around today watchingthe football and drinking a Bud, the world is a much better place with variety.
Course if we were all colour blind like many other animals , I am sure we'd pick another trait other than skin colour with which to prove we can be idiots. It'd be the bignoses or the baldies who would get it.