When James Carville said Pennsylvania was, "Picksburgh and Philadelphia with Alabama in between" he wasn't joking. I walk past houses which are sporting Trump signs and Confederate flags on a daily basis
Trump managed to win a handful of rural counties by larger margins than Romney, and Hilldawg got fewer votes than Obama. Organized labor used to be big here so I imagine there's quite a few olds who are registered Ds but vote straight R tickets now (to address the points raised in that twitter thread).
The Dems turning their backs on labor as a constituency is one of the "hidden" reasons Hillary lost PA, imo. It's also one of the reasons they are now in big trouble in some former midwest strongholds like Michigan, Wisconsin, and maybe Minnesota.