Not really sure if you're serious, but the night Trump was sworn in and took office, he talked for multiple hours straight, without a teleprompter (as always), with reason and a red thread through the entire thing. You may not agree with his policies, but to claim that his mental health is declining is ridiculous.

OTOH, watching Biden spontaneously become a Roomba, walking away in arbitrary directions, always having his handlers with him, etc. is ultimately sad. I dont think people point it out to ridicule, I think it's a serious situation, especially given the fact that he was commander in chief for 4 years.