Trump’s supporters claim that Biden is the one who is suffering from cognitive decline.

…and they have a history of accusing their opponents of exactly what they are doing — and what they are.

while holding a bible (upside down) that he doesn’t read?

Look at the photo-op photos. That bible is right-side-to (but held in a very unnatural way). This keeps getting repeated, and gives the Trump cultists something to point at and say “See? Facts are just a kind of opinion. They do it too.” We’re better than this.

Trump is supremely qualified — as a reality TV personality. Not holding something upside down accidentally is a reality TV 101 kind of thing. If you look at video clips you can see him checking to see that it’s upright.