One possible reason for the Trump Derangement Syndrome is that there is an unwritten rule separating the elites into New York financiers, Hollywood entertainers, and Washington politicians.
A person is allowed to belong to one of these, very rarely two.
But Trump has combined all three in his one person.
Everyone else have considered this a shocking breach of protocol. Or they just envy him. Either way, they have not forgiven him for such impudence.