Since 2018, Cantwell has been involved in an ongoing feud with members of the Bowl Patrol, a loose group of white supremacists who name themselves after the bowl haircut of the perpetrator of the 2015 white supremacy-motivated Charleston church mass shooting. In April 2018, Cantwell had been the first guest on the Bowl Patrol's new podcast, but over the following months he fell out with the group and became a target of prank calls to his podcast, fake accounts pretending to be him, and music videos making fun of him. Cantwell made violent threats towards the group, and followed through on threats to contact law enforcement, including the FBI, about pranks perpetrated by its members. Prosecutors later alleged that Cantwell emailed law enforcement more than 50 times over a four-month period in 2019. In June 2019, Cantwell threatened a member of the Bowl Patrol who went by the pseudonym "CheddarMane", saying he would rape his wife in front of his children and contact child protective services (CPS) about CheddarMane's alleged drug use if he did not provide Cantwell with information on the identity of "Vic Mackey", another pseudonymous Bowl Patrol member. According to prosecutors, Cantwell followed through with the threat to contact CPS. In September 2019, Cantwell met with the FBI thinking he was helping form a case against the Bowl Patrol members. However, the FBI were actually forming a case to prosecute Cantwell for his June threats.