I am not a white supremacist. I know you all are. I am interested to see whether you can convert me.
I'm not a White supremacist, and this isn't a site for White supremacists. You might be barking up the wrong tree here.
But as you titled this thread "Explain white supremacism to me", well, as I understand it, it is the desire for Whites to dominate or reign over non-Whites.