I haven't seen a ton of Knicks games this year, but from what I have seen 'Sheed looked completely disinterested on the defensive end. Like, just letting guys drive the lane and not putting up even token resistance, just lazy reach-ins. Maybe I've just seen when he was all tuckered out, but 'Sheed is a guy whose best attributes were on the defensive side.
... and the whole "BALL DON'T LIE!" screaming, getting himself kicked out of games because of it... makes him look like a caricature of himself.