[paulycy]

I can’t have knowledge of how every Southerner in every part of the South uses the expression.

Maybe this displaced los angelino still has it wrong! :0)

[GJones2]

Thinking ‘y’all’ is singular is forgivable in those who didn’t grow up using it. :-) Then too it’s often used that way in movies, especially humorous movies, so I’m not surprised that many persons are misled. Try listening more carefully to how Southerners actually use it, though, and I think you’ll see that they almost always address more than one person (or if one person, others are understood).