I'm going to get punched in the face for talking about nazis
Why are you going to talk about Nazis if you anticipate that reaction?
There is every reason in the world, I'm living in Germany.
Different areas of the world have different rules when it comes to hate speech and the groups involved. You should be aware of where you are at all times when discussing controversial subjects.
I'm not scared.
Remember that Germany has had a long time to come to terms with the atrocities committed by the Nazis.  German society has disavowed that government, so talking to them about it now will not accomplish anything.  If there are other issues that are bothering you, you should talk about them with the people involved.