Discrimination in education, employment, public accommodation, etc. on the basis of race, gender, creed and other things is literally against a whole host of laws: since white supremacism would make such discrimination a matter of policy--as it was in Jim Crow times--it is certainly true that white supremacism is illegal. I'm not under any rock here.

What you mean is that being a bigot is not illegal. That's true. But as soon as a bigot exercises social or economic power over the object of his/her bigotry then it becomes illegal.  

Given the distribution of power in our society, a person of color could certainly be bigoted against white folks--given 400 years of systemic white supremacism in the Americas, it would make sense--but there's not much chance that white folks are suffering from systemic, or even situational racism. What you're experiencing is discomfort over the now-widespread recognition that white folks have ALWAYS been a protected class in the US.