Misinformed, Stupid or Both/
The wife of a friend of mine used to work at Heathrow as Meet and Greet for American passengers who were arriving and being coached on to Southampton to join a luxury cruise.
She once had an American family who refused to get on the coach because they were told by their travel agent that they would get off the plane and get immedialtely onto a boat. They expected to walk from the arrivals hall to a large cruise ship that was parked outside at Heathrow airport. Having been told that their travel agent was incorrect, they still refused to get on a coach or in a taxi.
When you start having conversations with people like "Sir, we are in the middle of London. It's not possible to get a cruise ship that close to the steps of the plane", you know you're having a bad day.