I don't like rap, but how fun would that have been if he'd done that? I'd have loved it.
This is my thought as well. Even if it were a genre of music that I didn't care for, the fact that it was a free concert of something you usually have to pay big bucks for would be cool. I'd love to be able to say I'd gotten the chance to hear XYZ for free when everyone I knew had to pay a lot of money to get a far off seat in a concert.
It also doesn't say whether the people on the plane were asked before they got this concert. It could be that they were, and everyone on board was fine with it. We tuned in on the video, essentially, in the middle of things. We don't know that everyone wasn't asked. (And if they responded that it was ok when it wasn't, that's really not anyone else's fault - we say here all the time not to be PA if you have an objection. If someone has migraine tendencies, it is very possible to politely say that to a "do you mind if they do this" question and ask that the concert not take place.)