Whether it be twirling on the stage at a major U.S. music festival or giving a speech at the U.N. General Assembly, South Korean pop groups BTS and BLACKPINK are known for evoking screams of excitement from seas of adoring fans. But for all the global veneration, at least one part of the world seems unconvinced: North Korea.

Over the weekend, North Korean state media slammed its Southern neighbor for allegedly treating the two K-pop idol groups like a band of “slaves” who suffer from “imprisonment.”