Valid point. But, there are many reasons people are funny and like funny things. Sometimes I get the feel that I am laughing at something just to forget the harshness in life. Bo Burnham in "What's Funny" explains it better:

"Humor is often linked to shared experience

Like, a guy gets up and says

"Have you noticed that public restrooms have really inefficient hand-dryers?"

Oh, my god! Yes, I have!

Ha-ha-ha, really good point

They should fix that...

It's good to know that somebody finally gets me

Because my wife divorced me, which subconsciously forced me

To lose all sense of self

So, it's nice to think about hand-dryers and not that cheating whore"