Guess the joke is that she has some German phobia she needs to work out.
Well, since she didn't get triggered by Kriegsmarine Prinz, Z1 and Z3 (the Navy was technically not Nazi), I'd assume her beef is more with the Nazi Party specifically, and not just Germans.
Well, I'm sorry for our Comma-chan.Italy,This naval basehas folks from different countries.England,Nazi...
"Nachi" is how the Japanese pronounced "Nazi".America,I'm Naka Zhang.Chinese,Commander.Mongolian commander,No fighting!!What the!?