Doesn't shut up about it? He's said something, when asked in an interview, about 3 times in the last 2 years.The fact that he doesn't shut up about it indicates he's sill very bitter about it. Fair enough he may have a point but is it really neccesary to keep repeating it.
SAF pretty much said he didn't like his attitude and signed with Juve long before his contract was up with us. I trust SAF whole heartedly on matters like his, especially when it comes to the character of the player and attitude, he was 100% right about Tevez when the fans were thinking he was some sort of saint.