I also can't deny that there are black supremacists as well, and that there are communists, and such as well.
Today's "white supremacists" are the counter to black supremacists. When BLM gets to run around stealing, burning, attacking for 2 years in the name of blacks. When blacks get special treatment and consideration just for being black. When companies cater to blacks. When everytime you see a headline of a white guy killing a black person regardless of the situation it always mentions the skin color, but never when a white guy is killed. When a white cop shoots a black thug for attacking him after being approached for comitting a crime. When a white kid is labeled a white supremacist for shooting another white guy that was in a group attacking him. When whites are called racist just for having a different opinion and "roads are racist" then you're going to see people push back and are labeled as "white supremacists".
Nazis are the extreme conservative, and they are in direct relation to communists which are the extreme liberal.
If you really look at Nazis and white supremacists today you'll see they just want law and order, they want to be treated as equals, and dislike criminals.