LOL...I know, I've seen this before and always scratch my head.
If I invite friends from the U.S. Australia or Ireland over for a visit, my refrigerator is going to be empty by the time they leave. They're worse than the boys. But if I invite one of my British friends over I have to twist his arm to eat a cookie. What gives???
True story: One of my best friends from Wimbledon was over for a visit once and I asked him if he wanted a sweet roll. He replied "yes, thank you". I walked over to the sofa to where he was sitting and handed him one. At first he gave me a puzzled look, and then he went on to tell me that when a sweet roll is presented to a guest in England, it's always served on a small plate or napkin. I laughed and told him we weren't in England - we were in Pattaya Thailand, and if he wanted a napkin he'd have to go to the hung nam and get some tissue. He laughed, but you could tell he really didn't think it was funny.