Fascists don't understand that normal people deploy humor to make other people feel safe, welcome and connected to others around them.
When the particular fascist human shitstain in question, JD Vance, sees someone making a joke, they observe that other people like that person more and react positively, so JD Vance tries to make a joke too so that people will actually like him (lol sorry vice president of the U.S. isn't enough to make you popular, everyone still thinks you are a loser JD :) ).
Thankfully when JD does this he just tells on himself that he doesn't understand even fundamental aspects of humor and how twisting it for the aim of cruelty and violence will make you a permanently unfunny person in the eyes of everyone that matters.
There is no such thing as a funny fascist, because when you watch them tell jokes it quickly becomes apparent it isn't about creative joy it is about lazy hate.