Matt Barnes was one of the media members saying that Ime Udoka got a raw deal getting a one year suspension. To his credit, he immediately changed his mind upon hearing about what really happened. Of course unlike you or I, Barnes has the ability to actually find out the real scoop.
He shouldn't have defended Udoka and bashed the Celtics so hard before learning the full story. But that's what people like to do nowadays. Make up their minds before waiting to hear all the facts. To his credit, Barnes admits in the video he was wrong.