We call them "DJs without headphones" in Poland. They're [1] obnoxious in public transport. Now, I often considered speaking up, but figured out that if they're such a retard to do this, they probably won't listen and it could end up badly.
[1] Or maybe had been, seems they're on decline. Albeit when powerful BT speakers were all the rage (like JBL Flip), they were overused in public spaces as well.
If you have to "slap"¹ someone, and you will have to least you live in the desert, you will have to learn how to do it and to do it properly - effectively, proportionately, optimally. If you don't, then it's downfall in your quality of live and everyone else, and the environment and property value. It's the foundation of civilization to pull each other up towards civilized behaviour. Those areas in which reciprocal correction left way to "anything goes", I have seen, have decayed to rubble (and from heights).
To be honest, my hesitation is based on the number of local news articles that surface every so often. There's an alarmingly high number of Google results when you search for "zwrócił uwagę pobili" (he made a remark, they have beaten him) [0]
This may be in general a cultural factor. Even in non-violent contexts some people just do not want to be told what to do. I think Sarmatism [1] echoes to this day in many layers of the society in the form of ill-understood "freedom" [2]
Now, I may be selling Polish society short, most people are reasonably polite and the above are deviations, not the norm. But these deviations are still visible.
[1] Or maybe had been, seems they're on decline. Albeit when powerful BT speakers were all the rage (like JBL Flip), they were overused in public spaces as well.