Correct you are that grits are not a West Virginia staple. Brown beans, cornbread, fried potatoes, chicken, and dumplings are.
Incestuous dating isn't a West Virginian stereotype either. That'd (crassly) be a Southern state joke, and after seeing the type of man who occupied the White House the past eight year administration, maybe there's something to it.
Barefoot hicks? That, too, would be predominantly Southern Appalachian, but SOME of it is Mountaineer. Moonshine Stills were a part of the state's heritage, but so too was it all up and down that mountain region of states.
NOTE: The Beverly Hillbillies were from TENNESSEE and the state of Kentucky is legendary for exceptional bourbon.Hollyweird did, however, give the Mountain State "The Real McCoys", which was fraught with incorrect stereotypes (The McCoys of Hatfield & McCoy fame were from the Kentucky side of the Ohio river border).
So, what IS West Virginian? Hunting, trapping, fishing, coal mining, & historic mine disasters come to mind. Crooked politics of the Democrat persuasion would be the other. After all, West Virginia was sort of the Australia of pre-Civil War Virginia. All the scoundrels & criminals who were wanted by the state of Virginia knew they could escape justice there by high-tailing it "over the mountain" that soon became the border of the new state born in 1863, and that Virginia wouldn't waste the effort coming after them.