I disagree. There is, in fact, a great degree of self-hate/hostility toward all things African, present in many of the cultures. There are lots of people who are quite African in appearance, and many do in fact, argue with you that they have no black "blood". I have personally experienced this with many Dominican and Colombian women I have dated who were darker than I am. If you point out curly hair or full features you will be shocked by how many people say they come from the indigenous or Arabs in Spain, or whatever. It happens less in some countries that are more 'African' in cultural expression than in those that struggle to maintain links to the Iberian peninsula.
So while they don't have the one-drop rule, there are quite a few people who deny African ancestry when it's as plain as (pardon the pun) the nose on their face.