This article critiques current theories in books written by liberals so a good read. I've excerpted what I consider to be a good description of rebuttal tactics used to refute any argument.

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The Scandal of the Liberal Mind

".... Instead popular liberalism today seems to consist mostly of name-calling and conspiracy mongering (chiefly involving the Koch brothers). It’s become a cliché that liberals call you a racist because they’re about to lose an argument, but the swiftness with which liberals today deploy this debate-stopping label is a sign that they can’t even begin an argument any more. ....."

http://www.powerlineblog.com/archives/2017/07/the-scandal-of-the-liberal-mind.php