I think the reason why it’s a common belief that one should never “talk to nazis” because a lot of people would easily be convinced by them.

I.e., if a common person talks to a nazi and hear about their beliefs, they might at some point say “oh, these guys are right after all”, and then you have more nazis.

however, i’m an intelligent person and can actually discern what is true and what is not based on my own abilities, and wouldn’t be convinced into being a nazi just by talking to one. In fact, it would have the opposite effect and make the nazi a non-nazi, thus improving society.