Former GUNS N' ROSES and current VELVET REVOLVER drummer Matt Sorum says that GREEN DAY frontman Billie Joe Armstrong's profanity-filled tirade at the iHeartRadio Festival in Las Vegas last Friday (September 21) was "the most punk rock thing he has ever done." But Sorum added via Twitter, "Then [Billy] had to go and ruin it by apologizing. Corporate rock is alive and well. Never really bought that band anyway."Armstrong exploded after his band's set was cut from 45 minutes to 25, and he was given a signal halfway through their seventh song that they had one minute left. After screaming for two minutes at promoters, he smashed his guitar and left the stage. A statement was issued on Sunday (September 23), apologizing for the incident and stating that a number of other promotional appearances by the band would be canceled while Armstrong sought help. Billie Joe delivered the induction speech for GUNS N' ROSES at this past April's Rock And Roll Hall Of Fame ceremony in Cleveland, Ohio, saying, "The first time I saw GUNS N' ROSES on MTV, I thought, 'One of these guys could end up dead or in jail,'" He raved about "Appetite For Destruction", calling it "the best debut album in the history of rock and roll."