I've been on both ends of this. One of the local parks allowed for permits to use amplified sound which we took advantage of about once a month weather permitting. Lots of complaints to the point I often interacted with police. We showed them the permit, we'd show dB readings from a meter, the police would leave, we'd keep going. It's a public place being used in a way allowed by those that be. There's no bluetooth speaker today that can compare to our use of amplified sound.

We all have rights to be in public parks/trails/etc. Cities have ordinances about nuisance things like loud anything. If you're on a trail and someone comes along with a speaker you don't like, just let them pass. They aren't hurting anyone/thing, you're just annoyed. If you've plopped down in the park or at the beach when someone else comes along, you can talk to them about, but they again have rights to do it.

You are free to talk to your local representatives to change ordinances if that's how you feel. Good luck with that if that's what you so choose.

Local parks are quite different from hiking trails.

A public park and a trail have very different meanings in my mind. When I say that I have encountered this on a trail, I'm specifically referring to trails in places which are designated wilderness areas, which are not subject to any ordinance. The US has a lot of national parks, national wilderness, and BLM land that is completely open to the public. That's a wonderful thing, but it also does not make sense to call for a park ranger to get involved in what is fundamentally a discontent at someone else's anti-social behavior, when I can simply have a conversation with them.

Behavior, and the response to behavior, exist on a spectrum. The fact you responded to me pointing out that "you do you" has philosophical limits, but that those limits should not involve criminalizing behavior, by suggesting I should campaign to enact an ordinance seems extremely obtuse. There is no need to change the law to criminalize making noise in a natural area, but similarly it's perfectly appropriate to tell someone to stop doing it.