Don't worry about it, I knew what you meant
There are actually different levels. Rednecks are just southerners who like guns, beer, big trucks, hunting, camo, and country music, they can often be well educated. Hillbillies usually live out in the middle of nowhere (in the south) and live of the land. White trash are southerners who live in trailer parks, have horrible hygiene, treat women terribly.