I'm sure plenty of nice folks use "y'all" but unfortunately, from the perspective of a Brit on the other side of the ocean, it's not a positive thing. Because of recent history it will forever be associated for me with red hat wearing, low IQ fanatics. I can't help it either. The second anyone says "y'all" in a conversation I assume they're idiots at best and dangerous, racist, fox news watching fanatics at worst. There would have to be A WHOLE LOT of clear examples of nice people using that expression for me to change my view. I just haven't met any yet. I'm not trying to be nasty. I have literally never met anyone who use that expression who didn't turn out to be a terrible person.