It's all stereotypes. As I've done more therapy though I just realize that all the people that I know from the midwest really /really/ don't want to open up about how they are feeling. It isn't about swearing or being a part of 'polite society', it's about not addressing perceived issues interpersonally or in a group dynamic.

Like I just see from my hometown near Minneapolis that people would rather just act like uncomfortable things aren't happening or don't exist. They put on a smile and act all nice to each other but secretly there's all this shit that they harbor against one another. It is definitely a small-town thing too though. In a small town the people you are around have been there for a long time and they are going to be there for a long time in the future, so one way to cope with disagreement is to paper it over. Just not my personally favorite interaction style.

German here living in Sweden. The description sounds very much like Swedish/ Nordic behavior/mentality. And don’t many people in Minnesota actually have Scandinavian heritage?

Yes, but Minnesotans actually have a higher % of German heritage than Scandinavian.