The South is known for being hospitable and polite. The North-- isn't. But I beg to differ. The criteria for being polite in the South is just different than being polite in the North. Let me explain.
Northern children are taught please and thank you just like Southern children. However, in the South you have to add "ma'am" and "sir" after all your pleases and thank yous. Someone who was born in the North and moved South while they were still in grade school was telling me once how confused they were when they'd say please to their teachers and their teachers would counter, "Please, what?" They had no idea what the teacher was talking about because in the North there is no need to include ma'am or sir after everything. It's not impolite, it's just streamlining. Yankees like to get to the point. We don't like to dilly-dally.