Someone having a preference is not a problem. You can have a preference without excluding a certain demographic. When you have a preference to the exclusion of another altogether, that right there indicates a deeper problem. Most of my relationships have been with Indian guys. Do I have a preference for Indian guys? Perhaps. Have I dated other races? Yes. I've dated Black guys and my last boyfriend was white.
Having a preference is not in itself a problem. It's the fact that you seem to think that out of the billions of people on the planet, there isn't a black guy you'd consider good enough for you. If you or anyone else don't see a problem with that, you need to eat a truckload of cyanide filled dicks. Have a great day