well, I've never really run into any Europeans that "hate" Americans. The Germans were really nice, and the food was good. I found the Germans in Hamburg very "American" in that they wore sneakers shopping, and ate full sized meals.
To be honest, everyone was hating the Eastern Europeans and Middle Eastern immigrants so much that I found I was quite popular. The favorite topic of conversation was how "those" people were ruining the country. (It should be noted that I read 80% of all jail inmates in Belgium are foreigners).
I'm taking my head scarf so I can visit the very historic and beautiful Mosque when I go to Paris. I was a little nervous about wearing it out, knowing the recent legislation on the subject of head scarves in France. But, heck, a little rudeness makes the trip more interesting!