Traveled mostly in France, some in England and Italy. Pretty obvious I was American, and never got the slightest bit of crap that I knew about from anyone, even in France*. Had an Englishman in Nice approach me in a park and shake my hand about what a great thing we were doing in the Middle East, but I don't think that counts one way or the other.

*That I knew about. They could have been saying anything in French behind my back, I suppose. ;) The attitude I got from the staff at that one hotel one morning was mostly because my son tipped the orange juice cannister all over the meat plate.