It’s also the most normal thing ever. When have there not been regional rivalries and antipathies? Nation states have only been a thing g for like five minutes, historically. Local and regional identity has always been more important and it still is. If anything’s off in this picture it’s probably the notion of a “nation state” being a fake construct that people never actually bought into, not that people have somehow lost their ability to think like countrymen. They never knew.