Scott Adams named these, "Verbal Kill Shots"
While not pleasing to Elite political analysts, the labels work.
Here is another thought game:
Did Trump ever call his opponents' voters by names? (Answer, little or not at all)
Did an opponent ever call Trump's voters by names? Continue doing so? (Answer, yes)
What works? It is a logic and math problem, in part. If you need more voters, don't call some voters, Nazis and deplorables.
What applied in 2016 applies in 2018.