I totally agree with you, yet, I believe Griffin should have recognized there had to be a reason Stotts wanted to talk to them for a moment, for some reason. There's a huge difference between being a solid head coach and being a control freak who runs the team like a dictator, where no matter what he says, everyone jumps. It's possible - without realizing it - Griffin reacted because he felt Stotts was more in touch with his players than he was. If that's the case, Griffin's time as HC may be short lived.
Since I was never really fully vested in him becoming the HC, I'm thinking maybe he wasn't the right man for the job in the first place. Maybe, just maybe, the front office felt they needed who was a little more forceful in their leadership, and Griffen acted out to prove he was. It could backfire very quickly, if that's the case.