Why does he do that? Because the facts have always been a fun thing to Trump. Throughout his life he has bent them to fit the story he tells of himself. For most, it is disturbing and embarrassing to get something wrong – especially in a public attitude. Trump doesn't have that gene. Fact is what he wants them to be. And they can change, depending on his own circumstances. He tells a story about his life, where he is always the hero, always the winner, and then repeats that story over and over again. He doesn't care if objective facts get in the way.
The reality is that many voters – especially those who voted for Trump – never thought he was an honest guy. They knew he was lying about things – from the magnitude of his wealth to his many alleged golf championships to major problems like his behavior with women. They didn't care about it. Or more precisely, were they worried about other things more.
2) All politicians lie : Time and time again in the campaign 2016, when confronted with Trump's record of false statements, voters would tell journalists a version of this: Sure, Trump is lying. But all politicians lie! At least he's honest about it! Yes, it makes very little sense – especially because Trump wasn't honest about all the times he didn't tell the truth; He refused to recognize them at all.
But what the voters said – although they said it in a somewhat awful way – was that Trump was so different, so strangely transparent about his willingness to say something and do something to win that they thought he was was genuine. Even if they knew he was not of any traditional standard honest. And that was important because it differentiated him from the way people saw all the other politicians: liars but so smooth on what you never knew. Always trying to pull the wool over your eyes to serve the food they got from the bin and tell it was from a five star restaurant. Trump's lies were so over-top, so – in a way – ridiculous that people found (and found) them growing in an eye-roll, did-you-hear-what-he-said? manner.
3) Many people do not trust the media : Trump did not create mistrust in the media. In 2016, only 32% of the population told Gallup that they believed the media reported the news "fully, precisely, and fairly". (That figure, at the end of 2018, had risen back to 45%.) What Trump did does is watch the lingering mistrust in ways we've never seen before. "False News" has become ubiquitous in culture – as an ironic punchline for some, surely, yet ubiquitous.
The rise of Fox News – and its near-monopoly of conservative mind-share in the country – has gone astray with Trump's ascent and created both a political and economic model, where convincing people, the media are not just unjust but deliberately not to tell the truth that is earned for profit. Where we are in this country, if someone at CNN says the sky is blue, much of Trump's followers will shout "false news" while they are lying loud. They fear in the idea that the common media is completely obsessed with Trump suffering from a serious case of TDS ("Trump Derangement Syndrome"). They do not even go with facts because these "facts" come from a messenger (the media) whom they believe is the dismissal of their lifestyle and beliefs and will do everything – including lying about the truth – to perform some set of circles. sky-liberal goals.