Not that crazy but I'd never seen anything like it before.
Over 15 years ago, I was standing in a very long line at St. Basil's in Moscow. A small pack of tourists (half a dozen or so) started to "sneak" their way into cutting in line. About 30 French people in a tour group immediately started scolding them in loud unison. They shamed them into taking their place at the end of the line. It was such an automatic and united scolding. Highly entertaining.
A fellow traveler, far more experienced than I am, said that the French are known for doing that sort of thing.
France is south to the Germans, Swedes etc but north to Italians, Greeks etc. So there are both people trying to cut in line (it can be any one, an old lady or a young person), but then other people fight them back with loud "oh you are in a hurry?!!", "Oh, we just stand here, not queueing at all!!", or the "Heey! / Eeh!"
Well, the northen france is on pair with southern germany, but the idea here is the north/south differences, where in the north people are on time and follow rules, in the south not so much.
Curiously one of the only times I've seen a tourist trying to cut in line they were french, and tried to pretend they didn't spoke English (at the exit of the Harry Potter studio tour).
That's odd I've almost exclusively heard this said about Americans, British, and Chinese tourists. Though I have heard that the French will take you to task if you treat their home like it's some amusement park, which seems fair?