Why are there so many Southern stereotypes?

I've been on vacation and my family has been asked if we had Jack Daniels in our suitcase because we were from TN. My school went on a field trip and the tour guide instantly started talking in a horrible impression of a Southern accent. People seem to think the slave culture is still a thing when slavery was abolished completely in the 1860's! People think we are ignorant because we take our time talking lol. People think that every Southerner is a redneck. I apologize for venting, but I truly am curious why people think Southerners are racist and stupid.
Why are there so many Southern stereotypes?
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