That's where I see you're missing the point. These instances are adreninaline infused, no? Have you ever seen someone flexing get an opponent fired up to the point we saw flags of an unsportsmanlike type? I haven't.
A few things I see for certain. One, while he was standing beside him he certainly wasn't "in his face." Secondly, we don't know what was said. Thirdly, it's what I consider legislating enthusiam out of the game. The guy here just carried, practically, the entire defense and we expect him to control those reactions when it's that adrenanline drive that enables guys to make plays like this.
There's no harm here other than what I see to be a bunch of suits wondered about feelings: on a football field.
Horns Down!