I have no such perception of this Kirk. He seems little different than when Pike finds him in the bar. He has no respect for even his senior officers and is almost contemptuous of them all. He does not note anything abnormal about Marcus' actions and it appears the entire indoctrination apparatus of Starfleet has been changed as he seems completely oblivious as to the duties of what we have previously known as Starfleet. By contrast Jim Kirk in TOS, even in the 2nd month of Star Trek is shown to be highly competent, respectful of Spock, friendly with McCoy, respectful of his duty to Starfleet and its ideals and mission, etc..
The point is - a Starfleet Captain is also a diplomat by necessisty. Kirk can't even find it in himself to respect Spock in these first two movies. How can we expect him to respect anyone else? Answer is: it doesn't matter because the writers of these movies will never challenge Kirk in ways that make Kirk uncomfortable in the way he is put in TOS (e.g. Errand of Mercy).