Why do Republicans hate White Supremacists, Neo-Nazis, anti-immigrant activists, Communists and racists ?

Umm. They don't. The majority of the rights voterbase ARE white supremacists, and they're also usually fascists as well. The seeds of the Nazi party f*cking flourished under Trump. That's on purpose. We also know how they feel about the border, but if you're out of the loop, just turn on Faux news. They'll get back to blaming Trump's incompetence at the border on Biden at least once per day. In between whinging about the 'culture war'.

Republicans hate immigrants that are more brown than they are, and Communists. They specifically dislike China, and are brainwashed into thinking that Biden, or whoever else opposes the right, is working for the CCP.

Compared to Trump, both Biden and Obama are FAR more hard line with Russia and China than the right's Demented orange fascist ever was.

Because real Republicans defy the communist oppressors that try to control and destroy America and the world. Sadly, those members of the Republican Party who have disclosed themselves as communist terrorist spies against America, called RINOs, have assisted greatly in this destruction of America And The Free World. It's only a matter of time now until they are all rooted out and executed as All History will tell you happens to their like.

No.  That's pretty much their entire base, along with the neo-Nazis.

Because they are filled with self-loathing. By the way, you just described the entire Republican Party.