I don’t understand it either, frankly. Neither of my older sisters have one. Neither do my parents that I can discern. But I do. I hate it. My daughter makes fun of me. She was born in Florida.
Lol.. When I was driving from Homestead AFB (Fl.) back to Texas for 30 days leave.. I stopped in Northern Florida and I swear, there were more people at that gas station (I think it was Jacksonville) that talked with a drawl than any I had met in Texas.. :D