Could you list a few other cities which are known for such peculiar mannerisms? I was told Boston has its own stripe of the "Seattle Freeze". I find all of this incredibly interesting. If I could, I'd at least make a quick wiki of these observations. Frankly I think this is one of the elements that would figure prominently when considering places to move to, whether within the U.S. or globally. More so than weather or abundance of restaurants or even neighborhood walk scores!

edit: Earlier, HN didn't let me reply to you perhaps due to some time threshold I'm not aware of. So replied to myself. Deleted that post now.