If you're comparing dementia styles, Biden was effectively the type that is happy to sit on the couch and stare off into space while his family does things around him. Trump is the combative kind that is always trying to find the keys to the car to drive away and assert his own independence, and violently rejects help and concern.
As for your larger comment, you're probably closer to right in that bureaucratic authoritarians were much more like Idiocracy. President Dwayne Elizondo Mountain Dew Herbert Camacho had better leadership, speaking ability, policy planning, honesty, work ethic, intelligence, humility, and outright patriotism than the piece of pig shit currently staining our White House could ever hope for. He also didn't rape trafficked underage girls or pardon Upgrayedd for a bribe. The movie makes me long for simpler times.
But one of the pillars of Grumpism/destructionism is taking valid factual criticisms, but presenting them in a way that leads to a conclusion of normalization/nihilism/etc. For example, yes from when it was made Idiocracy has been a satire of the very real anti-intellectualism that has been everpresent in American society. But that doesn't justify dismissing its application to the current situation, as you started off your original comment doing.
There is plenty of criticism to go around when analyzing how we got to Grump, but keeping it in the right context is key.
Keep on at it if you're fine effectively supporting the current idiots. But don't be surprised when people call you out for it.