The cartoon below to me illustrates exactly what is the key problem in America for the past 30 years plus.
There is a concerted, well organized, well funded and highly successful campaign in this country to turn the populace against each other so the REAL enemy remains hidden.
And that enemy is modern corporatism/globalism. And it has thoroughly corrupted BOTH sides.
So much so that President Obama, a globalist himself, one of the more liberal Presidents in modern history - did more to enrich the super wealthy, super corporations than any President in history. That is inarguable.
Off topic, so keep this short: Other than preventing a re-occurrence of the Great Depression, raising the taxes on the rich, and raising them some more to contribute to the health care of the less fortunate, how exactly has President Obama done "more to enrich the super wealthy, super corporations than any President in history"?
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Other than that, I have to scold the OP, for he failed to name names. It is, of course, the authoritarian, illiberal left doing the dehumanizing. They are the ones who would dehumanize Republicans every which way. That isn't surprising: They are also known for dehumanizing gays, Blacks, immigrants, drug users, Muslims, journalists, women, trans people, the disabled, gun owners, and what have you. So, it's just standard MO for them, and they can't help it.