He probably doesn't know who pitching ninja is and is such a weirdo and thin skinned that his impulse is to trash anyone he associates with "twitter" because he read negative comments about himself.
He's literally the exact opposite of Benetti. I remember during the LAA series that Bill Walton did, one of Jason's other guest partners was the tv writer, Michael Schur (who was also from the old Fire Joe Morgan blog). For about an inning or so, those two guys were like trying to guess exit velocities and launch angles. It was great. Two baseball nerds watching the game and goofing around. That's what I want in my announcer. Not some unknowledgeable insecure combative guy who tries to start fights with radio hosts and twitter accounts or tries to appeal to people he assumes are meatball south siders ("Ah, hell naw, we aint taking that!").
He has made me yearn for Connor McKnight, which is shocking.