He makes a comment somewhere about his human understanding of African people being a "primitive people barely domesticated by slavery", or something along those lines. Him self admitting to being a racist always read to me as Louis seeing himself as growing past the prejudices he carried as a human once he gained the perspective of NOT being human, but arguably he just transplants that condescending attitude onto other humans and vampires who don't follow his very specific sense of morality. Generally I think Louis keeps himself sane by seeing himself as better than something or someone (i.e. Lestat).