POL CORRECTNESS - A SUBSET OF POLITICAL CORRECTNESS
My theory: these pundits - mostly beltway/establishment types - are terribly upset by his "Pol Incorrectness". Like our society, which is dominated by politically correctness, the political establishment is dominated by pol correctness: the idea that any politician must act according to established rules of the political game.
Trump violates those established rules. Trump is a businessman, not a pol. As a businessman I understand the vast majority of his ideas. I have worked with people similar to him my entire career - approaching 50 years. You can see this training in most of his speeches, tweets, ideas. But he is not following the establishment rules!
I have no idea at this point if I will vote for him or not. But I do know he is bringing something new to the game. And I do know where the societies Political Correctness and the establishments Pol Correctness has gotten us. And it is not a good place!