I'm from the South, and I guess it would be, to an extent.
The South tends to be more friendly, such as saying 'hi' to strangers, and other upfront social interaction with anyone
I don't feel as if most people on the spectrum, especially if they're up North, I suppose. I don't think I've knowingly actually met anyone on the ASD from up North (Never been north of North Carolina/Tennessee, never been west of Texas)
I've learned this over the years, and I don't this is quite as excessive as some people think with the friendliness, especially in Florida. Don't be mistaken, I live Georgia, and it still happens. I've learned to deal with it, but I don't get that much 'Hi, how are ya?'; s some may think. I wonder if it's because of my race.....
It's seems as if most people from the North come off as smug, arrogant, by the way they speak, and teasing the Southern dialect, such as ya'll (which I feel is used more Nationwide than you think), or 'fixin' instead of about, etc.
I would like to think I can tell the difference between someone who's being an a--hole or that they can't help it, as some people from up North seem to act like superior of us Southerners because of Southern stereotypes of intelligence, etc; because there are other indicators besides that that would indicate if they are on the Spectrum.
I was actually watching something on History Channel during the week of Independence Day and they had a special on how different parts of the country speak. They were accurate on most things that I was knowledgeable of, though I don't know much about saying Coke instead Soda. I lived in Metro Atlanta (15 minutes away) I didn't hear that much at all. I just know they serve nothing but Coke Products in most of their restaurants.......