This looks to be a safe bet, since the gang member Jimmy had killed was a drug supplier to Blue, the leader of the black prison gang. Wheelhead, a white inmate and leader of a group of white supremacists, takes Jimmy under his wing and offers Jimmy support if he joins the gang. Jimmy refuses, preferring to stay neutral.
This appears to be a reasonable choice because the person Jimmy killed was a drug dealer who supplied Blue, the leader of the black prison gang. Wheelhead, a white inmate and head of a group of white supremacists, takes Jimmy under his wing and offers him support if he joins the gang. Jimmy refuses, preferring to stay neutral.