Do you REALLY have to have the concept of "disturbing the peace" explained to you, or are you just comfortable with your rationalization for public/civic passivity?
Disturbing whose peace? There were a number of people in that gas station. Only Dunn saw the need to shoot someone because the radio was too loud.
“Disturbing the peace” is not the same as “hearing other people’s music”.
Put another way, you do not have the absolute right to go through life never being confronted with anything that disturbs you in any way, no matter how much you think your “peace” is being “disturbed”.
You will have to put up with hearing music you don’t like, seeing messages on t-shirts that bother you, seeing people doing things that annoy you. ON the bright side, you have the right to play music that others don’t like, to wear t-shirts that others will disagree with, and to do things that might annoy other people.