Until I was 10 years old I never heard a gentile speak German. My great uncle was a journalist who used the German language as a weapon against the Nazis and paid for it with his life. At the same time, I understand those whose relationship with German has none of the positive notes that mine does.
I have heard that german is a rational language, but never have I heard that it is beautiful. I think that beauty is something soft, balanced, sensitive, kind and poetic. Maybe french is more beautiful or maybe persian?
I wouldn't call it prejudiced. I'd call it biased. They have reason to be. Like 6 million reasons.