What's the difference between rednecks, hillbillies, white trash, trailer trash, etc.?

Rednecks always drive pickup trucks with a shotgun rack in the rear window and a Confederate flag decal plastered on the bumper.Hillbillies live in shacks in the hilly wooded areas of Southern states.White trash lives everywhere,even in the North.White trash always wears old torn clothing and they have bad teeth.Trailer trash are any poor ignorant white folks who live in trailers.(Hillbillies become trailer trash when they move to the city.)The defining line between members of each group is often blurred since there are so many crossovers