I think with Biden, people forget that he's suffered with a profound stutter all of his life which often manifests as being forgetful, or screwing up. There aren't many people on this whole earth who could have forged out a similar political career faced with that kind of a disability.
There is a huge element of double-standards here because lets not forget, Reagan was GENUINELY suffering with a degenerative cognitive disorder well before he left office, and republicans (and most of the media to a degree) let it slide.
Trump at this stage in his presidency was doing very little actual presidenting, preferring to just goof off in the residency watching extreme right wing media and Rage Tweeting about it, playing golf and rerunning his 'greatest hits tour' campaign rally in some other Redneck shithole.
I'd take an unfit Biden over the criminal orange dough boy any day of the week.