The Dunning-Kruger effect describes a person with little knowledge of a particular subject. With little knowledge you can confidently claim your superiority over those who have studied the subject extensively. You have no idea of the extent of your own ignorance and can confidently deny truth, while those with extensive knowledge on the subject are aware of their limits and are always controlled by self-doubt.
Authoritarian leaders with this state of mind feel threatened by those with more knowledge than they have and make a concerted effort to counter those so called intellectuals.
Trump denies truth, and confidently reduces everything to a matter of opinion. So if your opinion has more media coverage, then you are more believable. This is why the authoritarian attempts to control the Press, to reach more people and reduce information especially information containing knowledge contrary to his message.