I'd say it's another form of the Desmond Tutu quote: “If you are neutral in situations of injustice, you have chosen the side of the oppressor.”

Sitting at the table with Nazis and not killing or reeducating (forcibly if necessary) them implies tolerance of their intolerable views, which is thus functionally acceptance of their views.

I guess in a way?

The point is that you don't have to pull your hair out pondering whether someone is a nazi if they're associating with nazis.