Humor is subjective.
Would Trump looking lost next to Travolta be funny to you?
I wouldn't think it was funny only sad, that's why I wanted you to explain the joke.
Humor is subjective. My previous post standing
"Would President Trump looking lost...?" Yes
Would PM Johnson? Yes
Would Queen Elizabeth II? A qualified yes. This may be what you are getting at. If it was because she was socially awkward or in a socially awkward situation, yes. If it was that she had diminished faculties? No.
It would be reasonable to infer that you are indicating President Biden has reduced faculties. I'm not sure I agree with that. I think he is performing at the level of his age. I certainly do not know and that isn't my assumption.
Since you asked, I'll ask rhetorically. If President Trump was in that situation and it was because of reduced faculties, would you be posting cartoons lampooning him?