I'm willing to bet AB took the bait on the leaked "cobbled together" quote from Ben that seemed to throw AB under the bus in a big way. He likely didn't realize that was two separate discussions about 2 different receivers just slammed together.
I expect AB also took exception if Ben called him out a bit during practice, particularly given his previous game and contribution.
I don't really worry too much about players getting heated during practice. They OUGHT to be fired up and emotional. The team needs a great deal more of that. And believe me NOBODY is more sick of Tomlin than me, but when he actually DOES take a stand and make a move to punish AB for conduct detrimental, folks are roasting him like a Christmas Turkey. The fact is, if he'd done nothing and let AB play, we would be roasting him for not taking a stand with AB's ****.
In other words, he probably handled this one about right. AB was disrespectful, Tomlin benched him. That sends the message, "I don't care HOW big the game is, if you can't keep your **** together, you won't be in it." Honestly I believe that is the right decision. I got plenty of things to be down on Tomlin for, this aint one of them.