Rudeness/impatience/racism/short-temperedness/intolerance is far more prevalent in the North.
Southerners (on the whole) just seem more congenial.
Having lived in the NE and the South, there is a big difference in behavior. And, what "Northerners" see as "normal", Southerners would consider rude and snobby. Part of it is what you are used to. I think generally Southerners are much more outgoing and congenial to strangers, and will readily treat folks "like family". Something simple like smiling and waving, with a verbal greeting ('morning, good afternoon, etc), is a given, whereas you are not going to see that much in the NE, where "minding one's own business" extends beyond the home. There was a big enough difference for me to remark to myself, after a few months in SC, that the phrase "Southern hospitality", was quite true.