Depends on where you are. Houston is cosmo/metro area and overflowing with oil money, so I doubt many are sitting on the porch in some areas of town unless the butler is bringing them iced tea. Other areas of Texas, or even Houston, perhaps not so much. And sure there are areas of Seattle that are gang infested, other areas where you can't afford to drive though it, much less live there.
And a lot of the politeness of the South is as Nichole said, very much so to your face, Night of the Long Knives when your back is turned. I know people say New York is rude, and to a degree that's true, but I've always found the people there to be very friendly, and at the very least, they will tell you to your face what they say behind your back. You know where you stand and no one is wasting anyone's time.