two things right:

1. Tipping sucks.

2. Stupid American restroom stall walls with huge gaps and walls that are barely six feet high and that are two feet off the floor are the worst things ever. Even worse than tipping.

You can safely ignore just about any other criticism Europeans have of the US. Roll your eyes at them. Tell them how pathetically ignorant they are. Your're totally justified and totally correct, almost always. But you must admit they're right about these two.