I found this about what happened. Billie's reaction may have been extreme. However, it seems some reaction was justified. "Band picks up 'Best Internation Live Act' award (Aug 27) Green Day have been rewarded for their high energy stage performance by winning Kerrang's 'Best Internation Live Act' award. An awkward moment didn't seem to bother the band as Wattie Buchan, singer of Exploited, came onstage to deliver the award, and upon opening up the envelope, muttered "I don't fucking believe it," and stalked off stage -- before even revealing who the winner was. The band acted like nothing had happened, doesn't sound like something Green Day would do does it?"