Sorry, still catching up today. Here's an extract from the Washington Post article of 23 Jan, that Destinysdaughter linked at Sun 19-Feb-17 00:05:35, about dissing the media: www.washingtonpost.com/blogs/plum-line/wp/2017/01/23/dear-media-the-trump-white-house-has-total-contempt-for-you-time-to-react-accordingly/?utm_term=.e2ac55e79aba
For many months during the campaign, Trump not only told lies to a degree that was unprecedented in volume and egregiousness; his staff also mostly refused to engage fact checkers at all when they questioned his claims, showing he felt no obligation whatsoever to back them up. And then, even when they were widely debunked, he simply kept on repeating them. Then, and now, this was, and is, an assertion of the power to declare what the truth is regardless of what is empirically, demonstrably true.
Anyone who is not considering the possibility that this may be an outgrowth of Trump’s well-established authoritarian streak is missing what may be happening here. As libertarian writer Jacob Levy has written, Trump may be experimenting with a time-tested tactic, in which a leader “with authoritarian tendencies” will regularly lie in order to get others to internalize his lies, as “a way to demonstrate and strengthen his power over them.”
This is exactly what Michael D'Antonio and the other journalist discussing the Trump Tapes described happening at the Trump household/business level.
And it's very familiar to me because it's exactly how I've seen a lot of authoritarians operate in Africa. The degree to which people would tell blatant untruths and expect that the facts we could both see in front of us would be overridden by "Because I say so", used to break my mind. The technique relies on interpersonal power relationships being seen as more important than physical experience of the world. The opposite of science, in fact.
I'm sure gaslighting is universal, but I suspect cultures in which interpersonal relationships are highly prioritised are particularly vulnerable to this.
I've had people look me in the eye and say, "it isn't raining" as the drops are falling on us both. So I was 
when Trump made exactly that claim about the inauguration.