As a Texan who moved to New York City for the summer I really missed Southern hospitality (and Tex-Mex). When I came back to Texas the Southern hospitality did feel fake until I got used to it again. Although some of it probably is fake, I think most of it is genuine. Just like when I moved to NY it seemed like everybody was a depressed workaholic, when in reality that they are probably as you say trying "to minimize their impact on other people". Likewise I'm sure Southerners come off as fake until you get used to the culture. The pace of life is much slower and people love to make small talk. Also we don't ask people how their day is going so that we can figure out details about their life and judge them. Its just a nice thing to do.