The thing to remember is that “y’all” is a word from below the Mason-Dixon Line, & that automatically gives it an uneducated connotation. No one thinks a group of Rhodes Scholars is being addressed as “y’all”. It conjures a vision of sleeveless shirts, inbreeding, & cars parked on a front lawn.
Minor point but I really hate this performative “y’all” people do to try and appear more folksy. I don’t type in a Yorkshire accent and I did people would rightly tell me to shut up.