In the US "boom boxes" went out with the 1970s. They need to get with the times.
Okay, in all seriousness: boom boxes were a thing in the 1970s and early 1980s. There are still people who use the latest generation of them, but thankfully not nearly as many. These days people cranking music in a public place are generally doing it as part of a group that all want to hear the same thing. (and in back then the group wanting to hear the same music was the common case)
Here, in a small US town, the most frequent public music is one or two people ~destroying the speaker on their phone.
Second is probably motorcycles blasting it over the engine noise.
Oh I've never seen a boom box around. It's always, like, a box of car batteries and a speaker on top. Clearly DIY.