Slipknot frontman Corey Taylor and rapper turned pop-punk star Machine Gun Kelly have been feuding for the past few months. Last year, Taylor told a podcast that he hates “artists who failed in one genre and decided to go rock, and I think he knows who he is.” Then MGK talked shit on Slipknot while playing opposite them at Riot Fest. That escalated into an online argument about a failed collaboration involving Travis Barker. And during the Q&A portion of his show aboard the ShipRocked cruise this week, Blabbermouth reports, Taylor addressed the bad blood, saying it all started with MGK’s rant about rock stars who wear comfortable shoes on an Instagram Live interview with Spotify.