<moderator voice> I will acknowledge that cultural differences could play a role in boarding behaviour, but will note this has potential to easily turn in to an OMNI/PR discussion, so please tread carefully. </moderator voice>

As for your experience, I haven't taken the flights you've been on, but your statement is quite dubious based on my many hundreds of AC flights and the numerous other airlines I've flown. I've not seen any more bad behaviour, as a proportion, on AC flights than I have on flights on other carriers. My experiences boarding FR flights generally involved rude, pushy Brits and Irish people. Boarding in Italy is often chaotic, regardless of the carrier, as is boarding other methods of transport, because that's just how things are. Boarding in Germany tends to be fairly orderly.

I've taken about 500 flights on AC since they introduced zoned boarding, and I don't think I've ever seen pushing or shoving in the boarding area. And even on airlines or in locations where passengers have generally been less respectful of zoned boarding procedures than on AC, I don't think I've seen any pushing or shoving. As for cutting in line, that happens everywhere; even in rule-following Germany on Lufthansa flights, I've seen it.