Most of the ribbing is that he has a low pain threshold and is made of glass. Is this inaccurate? Might seem unfair for someone who is injury prone, but if you make the big dollars you need to be on the court.
His attitude in July toward the franchise didn't help matters either. There's a ton of things he could be doing right now to get fans on his side in this socially networked new world. He does none.
Ribbing justified.