I grew up in Auburn, AL and I raised my children in this tradition. The answer to your question is “yes” and “no.” We taught our children to say “Sir” and “Ma’am.” My son holds the door for his wife as his father before him does. My girls don’t quite understand how to wait for the men to get in position to do this. Hmmmm. There is still a deferment to older people but not quite as much as it was. It is not automatically assumed that an adult is correct, but issues of disagreement are attempted by many to be kept “within the family” and out of the public eye. It isn’t anybody else’s business.
Courtesy is very important.
Handshakes as well. My boys will always introduce themselves and shake hands with the person, also eye contact....I cannot stand mumbling! And phones off when in a social situation around adults and family!!