In the South East, they bring you sweetened (usually far too sweetened for my tastes) iced tea. This is amazingly universal.
I live in NC and have been probing the border for years.
For “nicer” restaurants, the universal sweet tea boundary seems to be precisely at the NC/VA border.
I believe they were confused, but I don’t doubt if there are differences between the US and other countries in regards to tea drinking, preparation, and serving standards.