To get back to the first question ... it has been our limited experience that, as other have said, we are treated more as individuals than as citizens of a particular country. That said, not infrequently when people in a casual restaurant or tavern find out that we are American they will ask us how we feel about things which our government
is percieved as doing (which may differ from what our government
is actually trying to accomplish), or they may voice support or opposition to vrious national policies or actions, but I have only had anything directed at me personally once - and that was onlyan off-handed comment. I was in a marketplace and commented that I didn't have enough money
to buy a certain item. A young woman standing nearby made the remark, "Well, if you didn't waste all your money
making war on other countries maybe you could afford other things." Rather simplistic, but she made her point!
All this being said, I have also seen several other Americans (as well as citizens of European countries) behaving in ways which greatly embarrass me - such as sunburned passengers from cruise
ships waddling along crowded streets in cities populated mainly by dark skinned people pointing and laughing at how quaint "they" are and trying to take pictures of "them" as though the citizens of the country which they are visiting have been placed there only as curiosities for the entertainment of tourists. All too often the term "Ugly American" comes to mind.
It has been rewarding to know that all over the world, people are people, and they will treat you as you treat them - and 9-11 and politics don't have much to do with it unless YOU bring it up.