In the UK filming in public and publishing the film anywhere is indeed a right and freedom, so you're mocking British concepts of freedom and the pianist for defending it.
It's ludicrous to claim you have a right to force others to avert their cameras when you are out in public, and that otherwise, your rights are violated. If you don't want to be seen, wear a mask. The public and its eyes/cameras don't belong to you.
You're not forcing people to act in any way by filmimg them. Filming is not an act of force, and yet you advocate employing state force to restrict it.
You haven't described any aspect of filming you that forces you to do something, yet still maintain a right to use force against those who film in public.
Unacceptable behavior would be unacceptable camera or no camera, since you're in public (even in countries that limit recording you generally can record illegal behavior, if it's to report it to law enforcement).
But the minimal standard for simply walking among strangers and for being recorded forever for the world to see is very different, if you care about your dignity.
And that's all assuming there are surveillance cameras to limit other actions in the first place
It's ludicrous to claim you have a right to force others to avert their cameras when you are out in public, and that otherwise, your rights are violated. If you don't want to be seen, wear a mask. The public and its eyes/cameras don't belong to you.