The bit about nazi jokes is surprising to me, and I suspect it's not true.
For starters, most nazi jokes I know I learned from Germans. I think the thing you can't do is make "jokes" that conflate "German" with "Nazi", otherwise, nazi jokes fly about as well in Germany as anywhere else. They may still be offensive, but not more so than anywhere else in the world.
I've definitely told nazi jokes in Germany, and it was definitely a German who started it.
The only German I know who is offended by nazi jokes that do not conflate Germans and nazis was alive during World War 2, so she gets a pass.
Or maybe I just have messed up friends, which wouldn't really be surprising.
The most shocking thing about Germany for me though, is Mutti. You start off thinking it's quite quaint, and then the more time you spend with Germans, the more you start to suspect it might be a
Futurama reference.