ooo... touchy. I think it's time that we all move on, though. Poeple that bring up things that happened a hundred and fifty years ago (literally or figuratively) are just bringing the conversation back to a place that they're comfortable. Chances are, when some one starts up, they're frustrated to begin with.
Not that racism doesn't stil exist; it does, and they might be frustrated by that. It's one thing to be born and raised in a culture long forgotten. It's another to be noticably ethnic. Nobody cares if you're Irish or Polish, but "black" people come from any country in Africa, and many of them don't know which one. Maybe it's the loss of the heritage that subconciously eggs them on.