I give him more credit for speaking personally about it on Letterman and not just making a press release through a spokesperson.
The video is difficult to watch. Not only because of the hate during the whole rant, but also because I think we actually witness him having a nervous breakdown, or at minimum some sort of anxiety episode. He is not a stand-up commedian, he is a character actor. He never seems comfortable when I see him in interviews or trying to be spontaneous. I think he simply lost it.