I dont like this definition of racist, everyone knows I prefer black girl but its not because of their skin color. Its because I like R&B and I like big voices which is why I like Adele, and Christina, and etc...
Racism is not the term you want because it would involve disliking whats different and thats not the case.
I listen to every damn person no matter what race or background and I am black. But if you were to see me in person you would not think I like the music I like.
Some people stan for artists who look like them because they have an easier time identifying and relating to them. It's not racism.
It's racism when you actually like and relate to an artist of a different color, but you resist supporting them because you'd rather support someone of the same color.