SWEET JEEBUS Y'ALL!

Is there ANY 'Southern' USAmerican dialect that uses y'all in the singular? I know in MLP y'all gets used in the singular on a regular basis. Having extended family all over the Carolinas, I have some exposure to country talk. I also know y'all is plural and that the singular I most encounter is 'ya' or 'you'.

Currently reading a fic where Apple Bloom is THE main character and the constant use of y'all in the singular is starting to drive me batty. What's worse is that for the most part they have the dialogue feeling very accurate, which makes the y'all that much more glaring!

Is this what it's like to listen to someone butcher your language?