Interesting perspective...
I grew up in Brooklyn, New York. Bay Ridge to be exact... while NYC is definitely not the friendliest place on earth, I always smiled and said hello to people and found that they did the same... As long as I went first. LOL
I moved to Pennsylvania to get out of the big city, and while the scenery was beautiful, I found the people to be rude, ignorant, and downright nasty with no desire to be anything more than that. And they bitched about New Yorkers... haha
Obviously, while Peaches says Atlanta isn't what it used to be, it's been a nice change for me. But here is something I have become very aware of in the last year or so:
I have found that people respond or react to others based on mood. I think that the "vibes" you give off have a lot to do with how people behave around you. I don't think it's a conscious thing either. You can think I'm crazy if you like, but I have seen it in action too many times to be able to discount it.