My ethnicity is English, Irish and German, but like most of us we are American first and foremost. I was in love with Britain until I actually visited, and like you I came away with a very negative impression. Subsequent visits just increased my dislike and now I hold most of Western Europe in contempt.
I only visited Italy, specifically Rome, and it was a fairly good place. Not much complaints or bashing of Americans, actually, barely any comment on America at all.
And quite frankly, I’m a bit too aware of the European bashing (My mom knew someone from her parish who had Greeks shun her for her American citizenship, and this was before the Greek financial meltdown). Unfortunately, I also know enough about history to realize that if we ditch them, it WILL turn out worse. Do I have to remind you of what happened to Vietnam after the Democrats sabotaged any attempts at providing aid to the South? I don’t want a repeat of that.
You are not alone.