I have no issues with “white nationalism” (why can hispanic, asian, etc countries be proud of their nationalism but not whites?), but white supremacy? Ugh.
99% of the time you hear somebody called a "white supremacist" he/she is nothing of the sort. An actual white supremacist seeks to conquer, enslave, or physically brutalize non-white people. Such people may exist, but there are barely enough of them in America to fill a phone booth. A "white supremacist" as a liberal smear word means any white person who defends his own nation and culture, or who simply refuses to apologize and wallow in abject self-hatred for being white. By the PC Left's definition, Steve King, Donald Trump, and anyone to the political Right of John McCain or Jeb Bush is a "white supremacist."