Practially everybody is racist, and that's a good thing.
If you can tell the races apart you are racist. e.g. "black" people tend to have darker skins than "white" people.
e.g. If you know that someone fits into a certain "race" category, and you're trying to find them, you don't have to search through those that aren't that "race", thereby saving time.
p.s. It seams that typical media when compares races(like this one), it implies that the goal should be that "blacks" have everything >= "whites", instead things being better for everybody.