Yes, he told the media he wasn't born in Croatia but in Krajina. That would be something like a Russian born in Ukraine telling people he was born in Russia (lets say Donetsk region).
He's not wrong, after the Croatian Army liberated Dalmatia in Operation Storm, a lot of the Serb population evacuated to Bosnia and Serbia. There were, I'm sure, war crimes during the operation on a lower level in the army and among the returning civilian population, but the operation itself and the command has been cleared of any wrong doing - the president of Croatia at the time, like him or not, was very wary of Croatia's image in the world.
So, Milan is right on that, Serbs evacuated / were displaced from Knin and those areas before the Croatian Army.
What he doesn't mention is that Croats evacuated / were displaced 4 years earlier, by the Serbs, because of the rising Serb nationalism and the war.
Source: I'm from Knin and my family moved to Zagreb and Zadar when the war started cause it was either that, or get killed. Our house was burned down and the Serb soldiers held my uncle at gunpoint in his own house, in front of his kids.
So... While I don't think showering anyone with messages and whatever is needed/necessary or OK in any way... Milan really doesn't paint the whole picture in his little sob story.
Conclusion... War sucks, people are capable of being utter crap to one another and these things really shouldn't be commented offhandedly or lightly if any serious conversation is to be held.