Okay - let's break this down bit by bit, shall we?
*sounds of brakes locking up* SCREECH! Stop right there.
That single statement is indicative of you being a part of the problem rather than a portion of the solution. The biggest reason that there is increasingly more constrictive legislation being suggested (and in some cases passed) regarding the use of aftermarket car audio by those of us who consider ourselves enthusiasts is from people like yourself who take no issue with being in a public venue where the average person there may not want to "share" your music yet you force them to anyway. Have a little respect and don't go bangin' through mall parking lots. Or school zones. Or residential areas. Or around hospitals. Or while sitting at the red light waiting for it to turn green. or... (begin to get the point?!?) next...
As you should if you're being disrespectful.
I'd be willing to wager as he recounted this incident to his friends it likely started out with something along the lines of "Young whipper-snapper had the nerve to go blaring his music through the parking lot where anyone could hear it whether they wanted to or not."
I'm fairly certain that he cared absolutely none about the distinction between musical genres //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif
Sometimes younger people just don't understand that it shows a complete lack of consideration forcing others to listen to their music whether such a display of audio ability was requested or not.
Think about it from the other side, dingbat ~ consider the fact that it is behavior (and thinking patterns) exactly such as you've described that gets our hobby looked down upon by those who are in a position to enact (or at least successfully lobby for) laws restricting our enjoyment and imposing increasingly stringent penalties for said enjoyment happening....