Something to remember is that nazis and other fascists are, generally, not very courageous. They use fear to oppress others, but they don't usually know how to deal with someone who isn't scared.

One of the most effective things you can do against nazi rhetoric personally, is to openly defy it. To make it clear that you are not intimidated, that their fear isn't working on you. This will leave most fascists with a lack of strategies.

This is not *entirely* zero-risk, of course. But they have way, *way* less bite than their rhetoric would imply.