Many people come up with this as an excuse to only date particular races because they "cannot help being attracted to a specific group of people"
The UN defines racial discrimination as "any distinction, exclusion, restriction or PREFERENCE based on race, colour, descent, or national or ethnic origin ..."
Believe it or not, many people also refuse to date their own race/ethnicity - that is also racist, no matter how you look at it
Person 2: She can't help it man; she only finds black people attractive
Person 1: What? That's racist!
Person 2: No man, it's "dating preference", get it right!