Democrats literally do not care about the white working class... Like, at all. They throw minorities "a bone" here and there to keep them "on the plantation," but that's really about the extent of their care in that department as well.
The modern DNC is, first and foremost, the party of the white, college educated, upper middle class, and their children who aspire towards the same, primarily in the bigger cities, and especially on the coasts.
You tell those people literally anything about the negative effects their desired policies tend to have on "Small Town USA," or the people living and working there, all you're liable to get are blank stares and crickets. Hell! You might even get a few chuckles, because the "well off and snooty" who make up the core of the DNC's base secretly kind of believes that the working class is nothing but "white trash," and deserves what they're getting anyway.
So, yeah... Of freaking course the white working class votes Republican. The Republicans, at least, pretend to care.