CEE ZEE - " ... I guess we just come from different parts of the state. No one says "y'all" where I live. No one. ..."
I was born in Alabama and later raised in Arkansas. I had and still have relatives all over the South. I have heard "Y'all" used all my life in the South, no matter where I traveled, but .................
I have never used it or heard it used in the "singular." It was/is always used as a "collective." If it is used by one person, it is implied that the one person is part of a "collective," or plural people. I.e., "Hey Joe, what are y'all doing tonight?," meaning Joe and his two buddies, or Joe and his wife, etc., etc., etc. If meaning only "Joe" himself, it would be "Hey Joe, what are
you doing tonight?"
I would hazard a guess the young woman in the video is addressing the "collective" who are viewing her video, rather than just one individual.
Using "Y'all" in the singular is more a fiction created by Hollywood writers and directors who think they know something of the southern way of speaking, but they only know what previous film and teevee inaccuracies have told them, creating the typical Southern stereotype. Kinda like the inaccurate use of guns in film and teevee. "Well I saw it in that cops-'n-robbers movie so it must be true."
My take on it.
L.W.