A lot of assumptions you make there. But go on and live in a world where you think Germans are still Nazis if it makes you sleep better. I’m not in the mood of trying to reason with you about that and get into the necessary details. If you’re smart enough, you can take a deep dive into current and recent German society and politics yourself.
Open and honest communication. Just say that you’re not interested in the game.
If the host gets passive-aggressive you could try to talk civilised about that. In case they don’t show the necessary understanding or are difficult to talk to, they might not be the kind of acquaintance you would like to keep.