Nobody here is finding it funny when a piano actually falls on someone. But we've all seen Roadrunner vs. Wile E Coyote, and most of us aren't so uptight that we get upset at such concepts.
Would you have found it better if he said a television set? Because hundreds of people are actually killed by toppling TVs every year. No one has ever been killed in the way depicted in the gag (and alluded to in the article), which is the piano is hoisted on a cable and falls on someone below (typically it is when moving a piano, and it is above a city sidewalk).
To compare it to joking about people with disabilities is just bizarre. Are you just concern trolling here?
https://www.straightdope.com/21344194/has-anyone-ever-been-k...