I studied Sinology for a year, and met a great deal of Chinese people. Whenever the topic came up, most of them - particularly the women - insisted that they would only ever date Chinese men, and were particularly vocal about not dating blacks or Japanese men. On the other hand, I met a Korean woman who had moved to Germany (where I lived at the time), and who said she had come looking for a husband, because she believed "Korean men are no good".
Interracial relationships are becoming more and more common, and with them come stereotypes: there is one stereotype that would have us believe that all women love black men, and another that all men love East Asian women. For many people (though not as many as the stereotypes would have us believe), these racial preferences in dating and sexual attraction are real, not just media tropes. There really are women who only date black men, and men who only date East Asian woman (as well as the reverse, and all other possible combinations).
The relationship of such preferences with racism are murky at best; is a woman who is mostly attracted to black men a racist, and if so, who is she discriminating against - men of her own race, or black men? Is a man who doesn't want to date black women a racist? What if he just happens to like pale skin? How can we tell what role racism plays in dating and romance, and when it's all just a matter of personal preference?