i haven't had much experience with French people, the only French person I've ever met was actually a pretty kind person. I'm aware this story very, very likely fabricated
It doesn't have to be. I managed to fill my car up with diesel accidentally once... the nozzle was the same size, just a different color (which I didn't notice until much too late).
Nah, this same thing happened to my cousin, forget which country she was in. The color for diesel by us is normally green, and she used the nongreen one and bricked the vehicle. May have been Spain.