Where do you hike where it’s a problem? I mean if I meet perhaps 10 people max over 2 hours. If all of them were blasting music it still wouldn’t worry me at all.
They can be optional. Just grant yourself a moment to let them go away.
Out of sight, out of mind.
I can't help but think it's intentionally deviant behavior, because any semi-ordinary person would at minimum reduce the volume to a reasonable level. But no, these folks have it dialed to the max, they want everyone within a 100 yard radius to know their shitty taste in music.