How does not having an attraction to somebody make them racist?

I wonder if not being bisexual makes somebody sexist.

I agree that sexual attraction is not a logical choice. If you tend not to be attracted to black women, that doesn't mean you're necessarily racist. It could just mean that, statistically, you have had a tendency to not be attracted to black women, and that can be for a variety of reasons, such as lack of black women in your vicinity. However, a lot of people, while not considering themselves racist in general, do in fact automatically rule out being attracted to people of specific races. In other cases, they have a fetish for a particular race. In both cases, that is in fact racist, because a conscious choice has been made on the basis of race. People's conscious choices can, to a degree, influence their tastes.

It's still not racism. Prejudice? Yes. But unless you're believing they're inferior because of their race then you're not being racist. I guess in the layman's version of racism you're being racist (regarding examples 2 and 3), but per the actual definition you're not.

Exhibit A: http://i.imgur.com/SbRtlOR.jpg

Relevant text from an OKCupid profile:

    Q: Would you strongly prefer to go out 
       with someone of your own skin 
       color / racial background?

    A: Yes
       No jungle fever up in here