I'm with bono and brick on this one, even I get angry at Higuain's attitude often too.
There's another factor. Higuain is a great an all around footballer and is pretty good at going a bit deeper to hold the play, pivot with his back to the goal, and all that... but he's never been asked as much as he has so far in this Milan. Not in River, not in Madrid, not in Napoli, not in Juve, and not in Argentina.
We're playing him like Zlatan basically, the guy is the playmaker and main finisher at the same time. He can do it, but he would be a lot better if his main job was just to chase through balls and crosses, and only occasionally do the other things. He is a killer world class finisher above all, who can also do other things, but not a prodigy like Zlatan or some other forwards who are either just insanely good at everything (like fat Ronaldo was, or maybe Suarez and very few others now) or physical beasts (like perhaps Dzeko or Lukaku these days, and even then...). I think his issues are another instance in which our midfield's incapacity to dominate the game, the lack of a real creative midfielder, and the poor form of the fullbacks and lack of a left winger make him look bad and frustrated.
"It is possible to imagine a distant future in which most other species of life are extinct but the ocean will consist overwhelmingly of immortal jellyfish, a great gelatin consciousness everlasting".