For the record, Bavarians call no-Bavarians "Preissen". This has historical reasons too, Prussia gained to unify most northern german states step by step before 1870. Bavaria and, i think, Baden (i should check this) were the last states and it needed a blackmail, war with France and a very sus death of the last king of Bavaria to incorporate this area

>I'm german and never noticed us having cultural divides like that. I'm specifically talking about the first unified Germany 1871, not 1990.

Ever been to Bavaria? Tried to have a long talk with an Ostfriese? Or what about religion, even in 21st century there are differences between catholic and protestant regions (Italy still catholic). Perhaps you dont see this bc you are German and are used to it, they are more visible for non-Germans