Being critical of MM's interview skills is fair imo, but to me, it seems that this discussion about his sideline antics is more borne of where you stand on MM. If you like him, it appears amateurish and petty. If you're indifferent to him, perhaps it could be better, but still maybe understandable. If you like MM, then he's showing passion for the game.
I personally like MM, and I like that he'll scream at a ref instead of just standing idly on the sideline. Could he have backed off sooner, sure, but I also don't think it's the most egregious thing he could have done. I think those of you that think it was atrocious are going to keep finding things wrong with him. If we were winning, this probably wouldn't be a big deal at all.