I'm sorry if living normally for you requires regular clapping, it must be a difficult existence.
The principle is reasonable adjustments, obviously banning singing along at a concert would change the experience entirely and would not be reasonable especially due to the noise that would be happening anyway. I'm not going to cry if I can clap at the end of a university lecture though and I'd be surprised if anyone actually does have that big a problem with it in reality.
I don't even think it's definitely the right answer, I just have no time for close minded dick heads who see that a minority have a problem that might be made easier by reasonable adjustments from the majority and just automatically rail against it and make fun of it instead of trying to understand if they can actually make things better for people who are struggling in life.