How did the redneck find his sister in the woods? Pretty good!
I don't know how to respond, because I don't fully understand what you said
You know exactly what I meant.
It sounds to me like you were making a joke about southern people practicing incest.  This is an unfair stereotype, as such acts were obviously very rare, if they even happened at all.  Decent people from rural areas could be offended if they heard jokes like this.