"If you see someone eating dinner with 10 Nazis, you're seeing 11 Nazis eating dinner.". I'm sure you've heard it, I think the saying actually comes from Germany.

If you think the saying is oversimplifying, that's fair. I always understood it to be more of a cautionary comment on the dangers of complacently sliding into extreme ideology, from a country that has deep experience with that. But of course if you apply it everywhere and in every context you can pick it apart.

In this context however - a true and unabashed Nazi party supporter, during the time the Nazi party actually existed, in Nazi occupied France no less - I don't feel any doubt in assuming the saying is 100% true, and that both Morris and her date are Nazis.