Is it that Germans are not so proud of their country, the reason you suggest, or that THEIR opinion of the U.S. is so low, the Germans couldn't imagine that our opinion of America would be any different and certainly not so different that we would have such pride in our country and our troops?
Also, Nazi Germany was pretty big on military marches, parades and 'Deutschland über alles'. That is why most Germans like to keep a distance to stuff like that and tend to be a little frightened or bewildered about that kind of mass displays of Patriotism, Nationalism and Chauvinism.