A Detroit police sergeant who allegedly criticized Beyonce’s Super Bowl halftime show by posting a reference to the Ku Klux Klan is being investigated.

The sergeant, who was unnamed but is reportedly a 17-year veteran of the department, apparently didn’t like the halftime performance — particularly Beyonce’s dancers, who were sporting afros, berets, and dressed in an all-black style similar to the Black Panther party. At one point in the performance, the dancers raised their fists to the sky and made a formation on the field in the shape of an X that, according to the sergeant, was attributed to black activist Malcolm X, WWJ TV.

The sergeant was so displeased with the performance that he took his opinion to his personal Facebook page, saying next year’s halftime show should include the KKK. The post included a photo of Beyonce’s dancers above a group wearing white Ku Klux Klan robes, according to a report by WJBK. It included the text: “So if the dance troupe at the top is ok for this years’ halftime show, then the one at the bottom should be ok for next years’, right?”