I would argue that it is. It's entirely possible for someone to take pride in possessing a certain characteristic or heritage without identifying with other individuals who share the same characteristics or heritage. Since nobody chooses to be Black, I don't think we're justified in being "proud" of it. One could argue that pride is a self-glorifying emotion that can lead to single-mindedness, a sense of superiority and a disregard for the the feelings and interests of others. As far as nationalism is concerned, I think love is a far more useful emotion.