Related to the indirectly car related OP.
Yeah the guy was playing music too loud, but ultimately so what? He’s in his space, in whatever mood; maybe it could be seen as rude.
What you did though, was escalate that to a confrontation. Directly and challengingly. As you point out you were prepared & ready for your comment to require a follow-up “decking”.
His bad, but yep, your bad. I’d say your approach maybe was worse considering your intent to follow up.
A great example, for attitude, is to look at the world through a flight attendants eyes and dealing with issues on board, in a tube of anxiety with hundreds of stakeholders - Who cares who is at fault? Ultimately it’s irrelevant to outcome. There are only 3 goals: de-escalate, de-escalate, de-escalate.