So far, I'd say either Montana or Wyoming.
Those folks are HAPPY to see ya.
The Midwest overall is good but I've had wonderful times in most rural areas. Even California. In fact, outside of the big cities I like Californians a lot; had a lot of fun in NoCal up by the Washington border.
For me, and this is without doubt personal bias, I generally get along pretty well in most any rural area. Was pheasant hunting in SoDak two years ago, saw two guys trying to get a combine tire off a wheel manually. Had my giant of a son with me, so we stopped and pitched in. Got that sucker off after a bit but it was real work. Anyway, had a great time with the father/son farmer combo while doing it. What can I say... those are the kind of folks I enjoy.
I just don't feel as comfortable in crowded places I guess. But then, maybe it's not me... what was that psych experiment with rats where they overcrowd them for extended periods? How did that turn out?