Rebel Y’all

Upon leaving a certain exercise venue just moments ago, I heard myself say this: See y’all later.
I am ap’palled. Who or what have I become? Who do I think I am? I am not even remotely Southern, and the only time I was in the South was on a layover in Atlanta years ago.
So what’s up with the “y’all”? What’s up with the Southern belle thing?
I’ll have to think long and hard about this over my lunch of collard greens and black-eyed peas.