I'm with you but you won't change anybody's mind.
JF hates him because he can't defend elite ball handlers in space, sometimes fails to box out, gets lost rotating, doesn't get enough FTs and rarely commits to defending the rim. He likes to take a swipe at the ball (it is rather Booze like) rather than riding the guy all the way in. He doesn't like to foul or be fouled most of the time, and he settles for outside J's a little too often.
I'm sure there will be somebody to come in and let you know some more reasons to hate him, but what does it matter? They probably won't change your mind either. It's ridiculous to expect him to be defending PGs out past the foul line, and calling him "black hole" is beyond retarded. But they do have legit reasons to bag on his game.