Possibly the dumbest thing I've read today, and I visited Rebecca Watson's page for shits and giggles. Don't worry - I've got AdBlock on, no revenue is going their way for my visits, only bandwidth loss. As for the tweet, let's completely forget about the world's largest institutionalized racial hate crimes, like, I don't know, the holocaust? Pretty sure that most slavs and jews that lived in slavic countries were, y'know, white-skinned.
Oh, by the way, "white" is not a race. White is a colour, there's a number of white-skinned races, or rather, "ethnic groups", since that's the politically correct term these days. They come in various shades, too!