That is such a stupid, tired old line. Would all of Europe be speaking german too?
Imagine that, the entire western world suddenly speaking German because of a war.. How fast do you think the conversion would have been? A few months, a few years? Out of the blue people would drop their mother tongues and become proficient in a decade or two...
Not being Jewish, German to you may just be another European language. However, in the movie/Broadway play "A Thousand Clowns" the main character humorously uses a German accent (speaking English) to entertain his nephew. Why? They are assimilated American Jews, as far as I can tell in the story line, and speaking with a mock German accent, like an old WWII movie, is done to "mock" Germany for their delusions of grandeur, in my opinion.
So, to many, German is not different than any other European language; not so to Jews, perhaps to Brits, perhaps to Russians, and I believe to Poles.
Your attitude towards people's identities may just be you, but since WWII is still in the memory of a number of European countries, Jews aside, you should give credence that German has a specific inference to many. You do not have to believe me.
P.S. Note how many European countries teach English. I believe that Europe learned twice in the 20th century that it would be advantageous for the US to think of them as fellow English speakers, just in case the US needs to help them out in the future. Just my opinion.