It's 100% racist. I think anyone who attempts to say that they are disinterested in a whole race of people is more racist than they'd like to admit, and is trying to make themselves feel better about their blatant disregard for a whole race. Think of how many times you see "no black" or "no asian", and then think about how many times you've seen "no whites"… The difference is quite obvious. Every time someone says they aren't interested in a whole race, it's almost always people of color. Are people trying to imply that whites are better looking than everyone else? Does that imply that whites are better than everyone else? Doesn't that sound kind of racist to you?
I myself don't typically date people of the same race as me, and neither has my boyfriend. However, we both have talked about instances of us being attracted to people of the same race as us. Yes, we both admit that they are rare instances of attraction, however neither one of us has completely disregarded a whole race as not attractive, because it's not possible to have judged every single member of a race. If you think you aren't attracted to a race, you're solely judging on stereotypes such as "chink" eyes, or big noses or big lips. If I didn't date white guys solely because I think every white guy has small lips and a small dick, I'd look pretty insensitive and ignorant, and like an overall jackass.
I think it's fair to say that not everyone in a certain race is gonna appeal to you. I think it's also safe to say that members of one race are going to appeal to you more than members of another race. That's fine, not everyone has to be your cup of tea. But to say a whole race of people doesn't interest you is just ignorant. Think of how many different looking white people there are... Would it be fair to say that you aren't interested in any of them? It's exactly the same with different races.