American style white supremacists don't want there to be nonwhite races, because a race is a people, and they don't want slaves to be considered people. Nobody cares about the ethnic identity of a cow. They only care about its pedigree for good meat or good milk. This isn't race in the human sense of the word. American style white supremacists want to be able to think of people of colour like that. They want white to mean human being, and black to mean animal.

There aren't many people who feel pride because they're smarter or stronger than an animal. There's lots of animal abusers who relish their power over animals, but I wouldn't call the thing they get out of their abuse pride. It's about having the power, not about reflecting on who one is as a person. It's not "I am awesome because I kick puppies." Likewise, the goal of American white supremacists is to have a society where people of colour are slaves, and white people get to think they're the only kind of human being in existence.