I just have to say …. That’s really lame to interpret what’s on that clip as “someone shaking hands with nobody”.
Equally lame is sharing the post, which seems to indicate that you are agreeing with the interpretation.
As someone who took care of a senior person, my father, with dementia for more than 10 years, (luckily it was slow moving until the last year or so), I can tell you absolutely that all this mudslinging that have been thrown in Biden direction, insinuating he’s suffering from dementia, are just incredibly insulting, because they are so inaccurate.
I hope you never have to learn about the truth of this condition from close up.