No, you can't use that logic. Thinking an entire race is unattractive is not a sexuality. It's learned. Whether you're gay, straight, bi, etc., that's something that you're born with. Homosexual is a well known and accepted term, for example. Have you ever heard of Whitesexual? Or Asiansexual? Anythingbutblacksexual?
Think about what a black person looks like. Like actually think about how many black people exist in the world, how varied and distinct black individuals around the world, hell, in one small corner of the world look from one another. You're really going to say you couldn't possibly be attracted to any one of them and that you wouldn't ever date one? If you're going to write off an entire race like that, then you are treating them differently and poorly.