Funny!
I'm in SC, small, small town. And even though I'm almost 40, I still say "yes m'am and no m'am" to anyone older than me. I don't realize how old I'm getting sometimes and catch myself saying it to people that are not that much older and I know it makes them feel like crap.(picking up bad language from Arizona Mamma, sorry) but it's so ingrained that I can't help it.
The teachers at our schools would think you weren't raising your kids right if they didn't come in saying it.lol I've got friends who teach and even add it in to books they are reading aloud to the little ones. Otherwise, they're stuck explaining answering questions about why the Magic Tree House kids aren't using their manners. They say the kids always point it out and it's just saves them the discussion.