I think his comment he made about "I like Stupid People" pretty much explains that one!
I think where Trump screwed up is, he never comprehended not everybody is stupid like his typical Trumptards. He never realized he was well outnumbered in a world of people that were smart enough to see him coming!
He won in 2016, because he told people only he could fix things, but after given the chance, a lot of those same people, saw him for what he was- a corrupt lying son-of-a-bitch out to make a buck for himself, and while feathering his own ass, he let the country get sick, jumped into bed with Putin and other fascists around the world, and by 2020 they were already saying never again!
The Truth is, Donald Trump is the stupid one! The Truth is Donald Trump hates smart people!