He spent months, or even years, saying his political opponent was not mentally fit enough to be president, especially because of his age. He is now showing that he is the candidate who is not mentally fit enough to be president, especially because of his age. Any chance to point this out, even if the individual instance might have another explanation, is perfectly fair game.

Although, I will agree with you, that he actually doesn’t give a shit about these people and that might explain the lapse too. But that ain’t any better.