Maybe that's why so many rich people think that it's funny.
Now that I'm thinking about this, I am noticing that, of all the things that I have felt since being tangential to the lives of rich people for a number of years, being prompted toward spontaneous laughter isn't one of them. I might even call them humor-impaired.
If humor and laughter are the emotional endorphins that prevent regular people from collapsing, maybe it makes sense that rich people don't often have a nice sense of humor. When they're upset, money numbs their pain. They also are exempt from striving for balance amidst the thousands of interpersonal encounters that regular people have to work their way through every day. They can be as rude as they want. They can be as boring as they want. They can ruin as many friendships, jobs, as much property, theirs and others', as they want. Their redemption is guaranteed.
They don't need other people the way that regular people need other people. If they have a problem, they can buy their way out of it. They don't have to think their way out of anything.
Maybe, after a while, that makes them lonely, and then they whine about that instead of changing how they live so that they stop substituting money for decent behavior. Maybe that's also why they are so amused by the plight of people who are trapped, unless a rich person is inexplicably arrested, jailed, fined, or loses a lawsuit; that's when they're full of empathy.