I have noticed this also, like some people need to be surrounded by a bubble of noise that disconnects them from others - even in fairly remote situations.

The next person I see who is blasting music from their idiotic bluetooth speakers up on a remote hilltop is going to have to be taken off the bottom of the nearest corrie by the Mountain Rescue Team.

I just argued against the OP by referring to the ancient Greek (and Roman) genre of bucolic poetry, but here, too, I should note that that same genre depicted the wilderness as a good place to play one’s flute or lyre. Maybe people with Bluetooth speakers are just continuing an ancient tradition.