IMO it was immature and unexpected from a player like him.
However, I still dont understand why they made a mountain out of a molehill. When a player is bad form and you suffer from a serious blunder from an umpire how would you feel? You will feed and maybe you may start cussing in the dressing room. This maybe disrespectful but there are countless cricketers out their who do the same including Aussies....even on the field