When it comes to romance there is nothing wrong with having preferences. You don't have to be an "equal opportunity" dater to be a decent person. You really have no control over what makes someone seem attractive to you. Some men prefer blondes. Some women only like men who are tall, or muscular. We probably all have an ideal "type" we think is most attractive . . . which we may, or may not, be able to attract to ourselves.

You can't always reason out why someone just doesn't seem attractive to you. It's not, necessarily, rational . . . and doesn't have to be.