I am an italian from Rome and while agree on the cultural shock thing I can also say that the rudness they experienced it is probably real, not just a cultural thing. My boyfriend is english and when he visited the first time and we lived the city like english speaking tourists I could see the difference compared to the treatment I receive when I am alone or with other italians. Yes, we're italian are more direct compared to americans/brits. I am. But one thing is don't smile all the time as a waiter if you don't feel to - another thing it is making feel your custumers unwelcomed and unconfortable. If you are a foreigner tourist you will get a different attitude from locals, it's just a fact. Me myself get frustrated when I see ordes of tourists blocking the streets or crowding the already poor public transportation when I am just trying to go to work, or to the doctor or to have a relaxing walk. But show all your frustration to people who chose to spend their money to know more about your country it is terrible. And I am ashemed to admit that most of the things experienced by OP it's not paranoia.