Really interesting post. I think that, by definition, it is a "racist" preference because it is based purely on race. But is it wrong? Or "bad"?
Well, some say guys prefer blondes and if we limit this to natural blondes, then we are eliminating huge swaths of the human genomic and racial diversity. So again, this would be a racist preference. But is it wrong?
Clearly, you have the right to be with whoever you want and certainly people have preferences (tall, short, thin, muscular, long hair, short hair, light skin, dark skin) and some of these preferences have racial alignments. Maybe this is one particular racist feeling that isn't wrong? Idk.
Let me ask you a question... Do you prefer light colored skin? Is that what your underlying preference is? For example, a white guy of Mediterranean ancestry (Spanish, Italian, etc) who spends a lot of time in the sun could be quite dark in skin tone. Would this be a turn-off to you?