“Nazi” is not a slur, and it should not be used for anyone who does not advocate those ideas.
Nazism: what it is, why we fight it, and how
Yonatan Zunger

I’ll further posit that it should be used for those people who do advocate Nazi ideas — such as identity politics and the suppression of free speech through violence.

If we want to punch Nazis, we should be punching antifa. They aren’t just a symptom, they are actually an instance of the disease of Nazism and fascism.