If your life is dominated by an us vs them dynamic small demonstrations of difference become hugely important.

In a similar vein different people in Xinjiang in China observe entirely different timezones - Han Chinese observe Beijing time (because China is insane and uses one timezone despite spanning 5), while Uyghurs observe a local time 2 hours behind.

It’s a small show of resistance, which is sometimes all a people have if they have limited control of their own affairs.