"See, I liked Green Day during this period. I liked them before they were all popular."
"Okay.... hipster."
"What? Green Day couldn't be farther from being a hipster band."
"I didn't say the band was hipster. I said YOU were a hipster."
"Green Day is a grunge punk band! The people that listened to them before they were popular were not hipsters!"

Song playing at the time: When I Come Around
From Wikipedia: "When I Come Around" was Green Day's most popular radio single in their early career, peaking at number 6 on the Billboard Hot 100 Airplay.

So, #1, he wasn't listening to them before they were popular, at least not in the "When I Come Around" "Period", and #2, I married a hipster.