According to Mark Feinsand of the Daily News, Joba Chamberlain took issue with Mariano Rivera asking him to tone it down while Rivera was speaking to reporters in the dugout in Kansas City before last night's game. Rivera asked Joba to be quiet during his autograph signing before the game, but Joba was apparently speaking to his family and didn't appreciate being told at what volume that could happen. "Don't ever shush me again" and "Seriously. Don't ever shush me again", Joba told Mo publicly in front of the media and anyone within earshot of the dugout. Rivera confirmed that the two hadn't spoken since, but mostly shrugged it off in typical Mo fashion.
Instead of being an adult about it and lowering his voice, Joba then decided to entertain the people he was speaking to with snark about how he "looks at it every day" and "has to be quiet" because of the interview. You'd think by now that Chamberlain would at least be professional enough to wait until he and Rivera were in the clubhouse away from the media and spectators to voice his displeasure with being asked to pipe down. That is not what happened last night, and now we'll have to hear about this for far too long.
The way I see it is that there are probably two people on the Yankees that you should absolutely never take a go at publicly and Rivera is one of those people. Joba has been seemingly making life difficult for himself for as long as I can remember now, and as an impending free agent who made his thoughts on his abilities as a starting pitcher known earlier in the season, it seems like his days in New York are quite numbered.
It's time to grow up, Joba. I can't really believe you haven't realized that before now.