[nitrogen]

I believe the OP. There's always a minefield when cultures collide. This is evident when someone from the US Midwest/Mountain West moves to SF for work. Just very different norms for how interactions are structured, and how good faith is communicated.

Because all involved parties basically look and sound the same, they judge one another according to their own local standards, instead of recognizing that they are actually interacting with a different culture.

Edit: for an additional existence proof of this midwest/coastal clash, see this comment which I had not yet read: https://news.ycombinator.com/item?id=27199709