Even if we ignore that White supremacists basically don't exist by any reasonable definition -- The fact is that there legitimately are African/Black supremacists, Jewish supremacists, Asian supremacists, Hispanic/Latinwhatever supremacists who are 100% real and yet not at all pariahs in polite society. More often than not, they're treated like heroes.

I'm not sure why I should uniquely hate such "Supremacists" only when it's White people expressing their in-group preference.