Wow! Luckily, my family were all grateful to have escaped the Famine and other horrors so they were very pro-America. They did hate the English and it wasn’t until I took my mother to London that she changed her mind! I never heard a nice word about Hitler or a bad word about Jews. But, then, they all were drafted into WWII.
I think my grandfather respected Germans, he was an engineer, and he had been to Germany, after all. I don't think he was as necessarily antisemitic as philo-germanic. I remember he had a German song book that predated Hitler. It a version of the Schnitzelbank song, which celebrated 'der Juden Meyer' ( I forget what he was rhymed with.) The objects in the book were illustrated with pen and ink drawings (Teller Butter, Schwiegermutter). 'Der Juden Meyer' was depicted with long Hassidic like dread locks, and ironically described as "oh du schoene, oh du feine Juden Meyer", "Oh you beatiful, oh you fine Jew Meyer." Remember, this is pre-third Reich.
I went to Catholic high school and I do remember my Irish-American classmates referring to f***ing Jew bastards, but probably just to get a rise from me. I wish I could say that I refused to take the bait, but actually, I was shocked, but didn't react. If I had to do over, I would have ridiculed their inane racism.