:wave: I'm from Alabama,
There are many people from the South, of all races, genders, education levels, and speaking abilities. I said nothing about people from a specific area ("Such as people from _____ county are rednecks") or people of a certain background ("Home schooled people from ______ are rednecks"), or people who live in certain housing units ("If you live in a one-story townhome, then you are a redneck")
So the argument boils down to who did I actually stereotype? There are groups of people out there who describe themselves as rednecks. Who delight in purchasing t-shirts, decal flags, written music all sporting emblems of the redneck culture. A traditional joke, told by many of the rednecks I know, deal with one's response to a tornado; which is actually a joke quite prevalent through much of society.
Communication is a process by which a message gets conveyed by a medium, and what message is conveyed past a dystopic factor known as noise. I believe that a culturally recognized and accepted joke would best convey my message to the greatest number of people.
However, after typing all that, if you are still offended, then I whole-heartedely apologize and promise to avoid such stereotypes in the future