Where relationships are concerned, the fact that you wouldn’t say, date a black doesn't make you a racist.
Maybe you are not attracted to them. Maybe a few minutes with them shows you that your world-views are too far apart for a long-term relationship to work, and that's what you’re looking for.
And maybe you'd be wrong about that. But you would not be wrong to make your own relationship choices based on whatever criteria you choose, and it doesn't make you a racist or a bigot or even a conservative.
They are open to other skin color and ethnicity, some are even open to same gender or bi-partners. They are adamantly against those who believe in a god.
I get this from what they write in their profiles and how they answer the potentially thousand of questions. Some answer 25, some answer 500.