David Letterman’s 33-year run on late-night television was marked by his acerbic sense of humor.
Upon retiring in 2015, he’s undergone a metamorphosis into someone almost unrecognizable from the more comedic guy people watched on the “Late Show with David Letterman”.
He’s grown a full beard, which coupled with his balding head, makes him look like a guy wanting to moonlight as a department store Santa Claus.
But beneath that kindly-looking exterior lurks a clearly bitter and troubled man, as evidenced by recent nasty remarks about President Donald Trump.
It’s spelled out on the next page. See how the funny guy seems to have lost his sense of humor.

Loser
You’re the ignorant one.
lol and you’re not??? You sure are looking old!
He is disgusting… He looks like 100 years old
Moron Dave
He’s an idiot and an$#%&!@*
Letterman must be off his rocker!
What an Idiot!
Trump is ignorant? Letterman has Alzheimer’s & needs medical help
Nice Commie beard, ya Karl Marx wannabe. #FuckOffLetterman