Okay, but... people with loud phones/voices in public places are absolutely fine with it because they don't care about anybody else's space or opinion of them. And they very likely are not afraid of instigating confrontation or assault either.
It 100% depends where you're at and the culture of that place, along with your perceived threat level.
People that are perceived as no threat or a 100% chance of being a deadly threat if ignored typically have no problems here. It's the grey zone where conflict shows up. Think of a little 60 year old grandma asking nicely the vast majority of people will listen. Same if you're a 6'7" slab of rock with tear drops tattooed on your face. Meanwhile if you're a minority asking a racist to turn down the volume, this situation is going to cause conflict almost all of the time.
He's not completely wrong though. I was assaulted (pushed and fell to the ground) for asking someone to turn down their music at a pool. And I think I've asked less than 20 people in my life to turn down their music.
