Biden in his dotage at least had the baseline sly, sneering, condescending personality trope that served to blunt questions that were too difficult or that he didn’t like.
Kamala on the other hand when she’s taken off guard by the least challenging question immediately starts running on and on like Ralph Kramden. She has no way to keep concealed her unprepared, scattered, incomplete intellect.
And then the nervous, defensive Wall of Cackles gets thrown up.