Machine Gun Kelly had some thoughts about Slipknot during his Saturday night (Sept. 18) headlining set at Riot Fest in Chicago, dissing what he called their "weird" masks. While Slipknot took to the main Riot Stage for an 8:30 headlining set -- following earlier performances from Devo, Ice-T's Body Count and Health on the same stage -- MGK hopped onto the Radical Stage at the same time.
"Hey you wanna know what I'm really happy that I'm not doing?" the rapper-turned-rocker told the crowd in a video captured by a fan. "Being 50 years old wearing a f---ing weird mask on a f--ing stage. F---ing s---."