The anarchist code of coduct says:
What is Unacceptable:
Degrading, disrespecting, or insulting another person or group of people, because of their :
[...]
So, being a nazi is a political opinion. Denying the holocaust or thinking it should be done again is a political opinion. Thinking jewish people control the media and trans people aren't real is a political opinion. Am I correct in gathering that it's against the rules to disrespect someone for having these opinions? Is it against the rules to say "nazis suck"? Because I don't like that.
Fascism crosses a line where it's no longer an "opinion" but an expression of intent - also known as A THREAT when that intent is, you know, genocide.
In other words, destroying nazis is a moral duty and ethical imperative.