Are you seriously making the argument blasting music or a movie or whatever is an involuntary bodily function?

Yes. Because I'm asking the question who decides what is involuntary or not. Who is it? It seems like there is a presupposition here, but who is defining that?

Coming back to the Tourette's example: let's say someone starts shouting cuss words and loudly annoying everyone else "involuntarily". Do they get kicked off the plane? Why or why not? Who decides that? Does the person have to present medical evidence that they have Tourette's to not get kicked off the plane? If so, can they also present medical evidence of a condition that causes them to spontaneously press play on their mobile devices with no headphones and would that be accepted?

I'm obviously not defending the behavior of the loud-music-on-plane-players, or advocating that everyone needs to smell everyone's farts. I'm pointing out that this is something that is arbitrary and weaponizable.