It sounds like there was a dispute over a sexting picture of most likely a girl at the school. The police were called probably from yelling. Not fighting as there is no assault charge. They most certainly heard about the photo but didn't do anything about that at the time.

The issue I take is the fact he was put in a jail cell for the disturbance part. Which was the primary factor allowing the police freedom to do what would otherwise be considered violating his rights, during a typical police stop.