Are you sure the backlash against Trump isn't because his victory made the anti-Trumpers feel stupid? It would be a classic trigger for cognitive dissonance.
It was shock, not stupidity. Maybe it shouldn't have been such of a shock, though.
Here's what I've learned about myself: I care about leadership. In the past, even if I didn't like a president, I saw that they had some leadership skills, even George W. Bush. We've had weak leaders, but we have not had in my memory anti-leaders - someone whose behavior is the opposite of leadership, someone who cynically exploits fear to divide people.
You might think he's a good leader but he's not. He's incapable of bringing people together, he changes his mind constantly, he's full of threats and bluster but little action, he always blames other people for his own mistakes, he's actually incapable of admitting a mistake (even to himself) which means he can't
learn from mistakes. He hires and fires arbitrarily, he has no coherent policy (MAGA is a slogan, not a policy), and I could go on. Leaving politics out of it, Imagine if he were your boss. Would he have your back?
Putin has a high approval rating because he is a
leader. Maybe an unsavory one, but he has real leadership skills.
In 2000 Trump knew damn well that cozying up with white supremacists was a bad idea. He said so, calmly. But then he found out that stirring up fearful white people would win him a solid block of the electorate. Wholesale bigotry didn't used to work (in America). George W. Bush strongly emphasized that the war on terror was
not a war on Islam. But the mood changed and he got good response to his crusade to prove Obama was born in Kenya. He learned to expertly leverage the anxieties of fearful white people. They're thrilled; Trump is their salvation. In some cases perhaps literally - they want Armageddon. They want the world to end.
That's not particularly reassuring to the majority of voters.