Oxymoron: "a figure of speech in which apparently contradictory terms appear in conjunction."

Thus "white supremacy is an oxymoron" because the assumption that 'whiteness' is supreme is itself resulting from an inferiority complex among those who think they can and must preserve and promote a supreme whiteness as an ethnicy, though this is not really possible, and is especially naive on several levels, showing great concern, suspicion, paranoia, pessimism, privilege and prejudice by self-styled white supremacists who are of course famous also for hiding under masks; hence white supremacy is technically white inferiority complex.