Would it be better if he just kept quiet and let the health issues he is seeing go unmentioned because otherwise it would make people look bad? Do you think his book is just an exercise in mockery because he enjoys it?
I think viewing things that way is akin to thinking wet streets cause rain. It is placing (often very selectively) an undue amount of agency upon a voter, whose effect on the political system at scale is essentially nil.
And yes, I do think mockery has become de rigeur in American politics, both left and right.