There's also the instance where they just gave him the shirt and said, here kid, wear this because your character is supposed to be into punk music, and he's like okay cool! I hope it was his own idea but know way to really know. Yeah, GD was fuckin huge in the 90's before all the AI stuff came about, and very rough around the edges people would listen to it, it was heavy. AI made a lot of people shut their eyes to the band with the drastic change but in the midst brought a completely new wave of kids to the dance and a lot of old school metallers and punks retreated back to their heavy roots. They will continue to say that is when Green Day was awesome but truthfully, they have just given us so much since. No doubt though, Dookie was just as big as AI on radio and stuff, Nimrod got a ton of airplay too. Wonder, based on his age if that kid was into the old music, most likely was, or if JB just handed him the shirt or something, also a possibility.