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Nobody engage with this person. Just do what the other person is doing and block them.
They know deep down in their heart that Republicans have always been Fascists and Nazis. I used to vote Republican thanks to my brainwashing parents, and even then I still knew better. I used to make jokes about Nazis, as if they were no big deal. But then I grew up.
I actively avoid speaking to people at all hours of the day. People are boring, and they annoy me.