That's an exaggeration... he's just speaking the truth. I might've said the same thing about House earlier in the playoffs when he was not playing.
Just because he finds it tough to sit, etc. it doesn't mean that he's there causing trouble. Remember how Pierce credited him for going off on LeBron? And since he has been benched, I've seen him being quite active in the bench cheering on. This is just talk that doesn't ammount to much.
The last portion of the quote is the accurate one of the situation. Big Baby talked about this earlier on the year, on how it was tough to adapt to a new situation as he came to the NBA because he will be on the bench more instead of playing big minutes... was his complain then an "Ubuntu Killer"?
I would be worried if he said "You know, I'm fine with the benching because I suck and others are better than me", that's weak minded. It's not who he is, and not what we need from him. You need to feed is need... his ego, and he does plenty of it by himself.
This is a good locker room. It's tough, with many strong personalities gluing it together. Let's stop treating it as if it were made of glass.