One of electronic dance music’s biggest stars went off on one of music’s biggest icons, reports Entertainment Weekly. Madonna appeared at the Ultra Music Festival in Miami this weekend, where she introduced electronic music DJ Avicii to the stage. During the intro, she asked, “How many people in this crowd have seen Molly?” Molly is slang for the “pure” form of MDMA, otherwise known as ecstasy. While the crowd became gleeful about her question, DJ Deadmau5 became livid. He took to Facebook and wrote: “Very classy there madonna. such a great message for the young music lovers at ultra.” In a second post, Deadmau5 added, “That’s your big contribution to EDM (electronic dance music)? Thats your big message to ultra attendies? hipsterspeak for looking for drugs?” He went on to call her an idiot.