Growing up post-War, I "knew," when I was very young, that Germans were bad and indeed confused them with "germs." (I write this not as an attempt at humour but because that was how my childhood mentality processed verbal inputs.)
In my teens, I read:
"'...that is the way of the Boche. He's never so happy as fouling another's nest.'"
-Dornford Yates, Cost Price (London, 1949), CHAPTER I, p. 19.
"'...German hands are too filthy to finger such a treasure.'
"Be sure I agreed with him."
-(ibid., p. 20)
"'Austria is a gentleman: Germany is a cad.'"
-op. cit., CHAPTER IX, p. 277.
"'Jonathan's right,' said Jenny. 'Germany is a cad. She is the cad of Europe, as England is the peer.'"
-ibid.
(Jenny Chandos is a beautiful character but, like all of Yates's heroes and heroines, she is a mouthpiece for her author's opinions and for no others. Yates was living in France but had to get out before the Germans arrived.)
I regret to record that I did not regard these remarks as reprehensible. How was I being brought up? Two American sf writers to the rescue: first, James Blish told me that he liked many things about Germany, including the language. Secondly, Manse Everard of the Time Patrol reflects that Nazism:
"...would not, could not have come to power in the country of Bach and Goethe, except through the unique genius of Adolf Hitler."
-Poul Anderson, "The Sorrow of Odin the Goth" IN Anderson, Time Patrol (Riverdale, NY, December 2010), pp. 333-465 AT 1935, p. 424.
Bach and Gothe: filthy cads?