People have this tendency to want to do reasoning by analogy, but then if you look at the things they're analogizing to, a) they're often distinguishable in significant ways and b) they even more often don't actually address the criticism, they're just an example of the bad thing we should be trying to prevent already happening somewhere.

What am I supposed to do other than point that out?

I don't understand you, here. If anything, you seem to just be describing your own argument.

You ask why we couldn't have a single frequency for long-distance radio communication. Which is either willfully ignoring all of the frequencies that we can use for directional communication. Or shockingly ignorant over how many people could use a "single frequency" for anything long distance. (Indeed, this was the wishcasting that I found off putting.)

You then reduce to absurd the idea that you could have a concert between two other people. Which, I feel fairly confident saying nobody cares if you are running small two person concerts at your house. Unless you are violating noise concerns of your direct neighbors.

And then, your entire "they are doing this in their home" argument ignores that the problem here is open solicitation across the internet. If you are setting up a LAN equivalent where only direct friends ever gain access, this is just not relevant here.