It really is odd and highly uncharacteristic it would seem. That only makes me think that something significant enough happened behind the scenes and caused him to snap and act like this, or we really had no idea who Kane really was.
He is an incredibly polished person from a media perspective, in that he doesn't stir any controversy and always knows what are the right PR talking points at any given time. I had always taken it that it was just how he is, but now I think that we were just always getting the alternate version of him that he kept hidden.