Democrats have quite literally always portrayed the GOP as rich businessmen tricking a bunch of useful idiots into voting against their interests, be those idiots zealoty Northern Protestant puritans in the 1800s, farmers in the 1950s or poor White Southerners today. After a while, in a liberal's mind (no offense, just contrasting how I believe liberals and conservatives view the world), the only logical explanation for why people would vote for this party you view as stupid, racist or greedy is that those voters are stupid, racist or greedy themselves. Once it's been concluded a group is any of those things, what is the incentive to not let 'em have it??
To be fair, working class white Southerners have pretty solidly demonstrated this election season they don't actually know what's in theirs or anybody else's best interest by backing Trump, a rich businessman tricking a bunch of useful idiots into voting for him. 
Sick burn dude! That's how you win elections, right?
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