People are nice down south because they are ignorant, and believe fictional accounts of the Meaning of Life, like the Bible.
You need to discount this trivial experience you had and embrace the lib model of bitter, racist, hateful idiots that is most certainly a more accurate description.
Welcome to Red State America.
I had a patient from Atlanta, black woman, who said yes sir, thank you sir- very polite to me. I had to tell her she doesnt have to call me sir. I talked with her awhile and found out her kids say yes maam and yes sir to her and her hubby. She said her kids would never disrespect her or anyone else. I was refreshing to hear some parents are doing it right