Apparently Trump doesn't spell well, when engaged in midnight "tweets." Journalists, who think of themselves as part of the elite and for whom words are bread and butter, are appalled.
In spite of his wealth and formal education, Donald Trump most reminds me of the ordinary blue-collar guys I know. His approach to politics comes under a similar sort of criticism: he doesn't care very much about facts, and journalists are also all about facts. So they think he's an ignorant ass, as they think the blue collar guys are ignorant asses too. They're wrong on the merits about so many particular facts, demonstrably wrong.
What people miss is that guys like this are principled in a way that is sturdy and reliable. They don't care about the particular facts because they care about the universal principles. They have a principle that manufacturing jobs are what made America great, and therefore they want more of them. All the particular facts about a particular case you can muster aren't going to undermine that principle. ("The Carrier deal was not that great!") Their principles are what they believe in, and they're going to do what their principles tell them is right.
Given that principles are pre-judgments about cases of a certain type, they are in a literal sense prejudices. But when we say that someone is "principled," we don't mean anything negative as we do when we say that someone is "prejudiced." Normally it's taken to be quite a positive thing.
Nevertheless, it does present difficulties. You can't talk them out of doing what they think is right in a given case, even if it's not the ideal solution in that case, because they're not interested in particular facts about particular cases. They're governed by universals that stand above any particulars. Telling them that they're wrong about the particulars won't bother them because they don't care about the particulars at all. They have lasting ideas about the world and what right looks like, and that's where they put their faith.
It's a very different world from the one that journalists live in.