I don't see a problem with anything he said or did really.
He is clearly slightly disingenuous in terms of everything - image, self-confidence, things he says. What he is trying to do at Milan is not that unlike what Mou did with us, trying to slightly project that "us against the world" mentality. He talks a lot of shit, in fact he talks so much shit that no other player could get away with it other than him... yet he does. Because of two things exactly - he belongs to the generation of players a lot of current younger ones hold in the highest of regards, and two - he can actually back it up by still scoring goals routinely.
So if he wants to talk shit about an ex player who left in a dire time of need when Milan have - well, had - a legit chance at a scudetto, in an attempt to raise the morale of his squad, so be it. All is fair etc.
Some of you take everything at face value. In Zlatan's defense, it must be quite difficult to not only push yourself physically at that age but to also maintain the persona in public. His arrival turned Milan from a midtable club to a scudetto contender with zero transitional seasons.
And even if some here refuse to see all of the above, he was still one of us at one point in time and massively contributed to our success in that era. That should still count for something.