This reminds me of a time when we were hosting a visiting scientist from Portugal, and we went to a nice steakhouse for lunch. Almost all of us got the buffet, but I think he got prime rib and salad bar, and asked the waitress for a side of cottage cheese, because they didn't have it in Portugal and he loved it. The waitress looked at him, opened her mouth, and then closed it, then said, "Are you sure you want that with everything else you ordered?" I was mortified, but he wrote it off as "Ha ha, you spunky Americans!". The tone of her voice was absolutely hateful as well, and I suggested we tip her 10%, because she was rude, not just to him, but to everyone, but he insisted we tip her 20%. I've never been back to that place again.