Saying ____ race is unattractive or I don't like ____ race because _____ almost always is based on stereotypes/prejudice though.
I'm 99% sure there are attractive people in every race.
If you just so happen to date your own race fine.
If you just so happen to date x, y, or z race fine.
If you exclusively seek out a certain race because you don't like your own that's not a good thing.
Ex, I remember one black guy said he would date Taylor Swift over Meagan Good solely because she's white and not because he was actually attracted to her, that's not fine.