Words do not come from a vacuum. When one jokes in public, I always note the words chosen.
Professional comics work tirelessly at their routines, often testing out their lines upon smaller audiences, which, by the time it is on the "big stage", it is often from memory, and not the free editing process.
Yet, words reveal us, and once moved into the free editing process, the speed of language increases reliability.
In 1969, Bill Cosby joked about drugging women for the purpose of sex.
Louis CK gave this monologue on SNL.
Recognizing that the purpose of humor is, sometimes, to shock, and that free speech was something so important to our founding fathers because it was not intended to protect the rational, acceptable, or common speech, but the disagreeable, outrageous, and even illogical that needed protection.
Just as SNL has the right to say what it wishes, via those they choose to be on the show, so do viewers the right to tune out, and now through the internet, share their disagreement publicly.
If a comic continually makes humor of current events, he will reveal his own political leanings.
If a comic continually focuses upon a particular issue, we recognize the sensitivity of repetition. If a topic is repeated often enough, viewers will wonder if he has an issue he is projecting.
I have also used this to demonstrate Statement Analysis in public, asking someone when they make a joke if they can identify where it came from. The most common reaction is:
"No, I was just joking."
A few follow up questions, sometimes privately, reveals the truth. The topic was on the person's mind, due to...
any number of reasons, including a song playing in the head, a movie, or, something that is more likely:
When people "joke" about important topics, there is often a reason behind it.
One recently "joked" about quitting his job and leaving his boss flat. It appeared to be "just humor" but in a follow up discussion, he was feeling under-appreciated and under-paid.
I find this commonly done in "jesting" with a spouse. It can even be uncomfortable for others and the 'vinegar' in the words generally has a source, and I find that it is not...not usually movies, and such, but personal.