Bottom line is this:
Usher's lip-synced, choreographed bullshit performance ran 25 minutes overtime. Rather than extend the entire show, they decided to cut green days set in half, to make room for more choreographed dance lip-synced garbage.
So one of the few acts of the night that actually played real instruments and sang with their actual voices, got shafted. Sad, because it shows what the masses really prefer nowadays.
Billy Joe Armatrong isn't a "kid with a guitar" either. The dude is 40. He's been at this game for a long time. He came from nothing, and paid his dues. Tours like a mofo. He's earned it.
And just because rock music has hooks, and is played in a major key, doesn't make it "pop" music. Listen to Bieber or Carly Rae Jepsom. That bullshit is pop. True, Green Day is not "heavy rock", but it's still rock. (and the dude has killer tone to boot...)
I'm totally on BJA's side here. F*ck Usher, and f*ck the suits that opted to cut Green Days set.