I think the bigger message with this is the co-opting of a certain style without learning anything about it.
For example, in Wayne's World, Garth and all of their friends were constantly wearing band t-shirts. Deep Purple, Jimi Hendrix, Van Halen, Led Zeppelin. Now, they may not have gone to the shows, as they were too young, BUT they valued the music that these artists created.
What we have now are people who have no idea who these artists are, what they've created and they just say, "I dunno, but gee doesn't it look swell?" You can imagine that someone who waited all night for concert tickets, or all weekend for that matter, and then went to the show, bought the overpriced t-shirt and then a few years later while still cradling the memories that the show has given them sees some 14 year old in a brand new shirt of that same band and has absolutely no idea who they are, what they sang or what the music even sounds like...I would be a tad miffed myself.