CMC would definitely say stuff like this behind closed doors. I remember the camera catching him saying something like, "they think they're so ******* smart" or something like that on the sideline against Iowa back in 2019.
An Eastern Iowa radio guy made a big deal about this at that time. He obviously flips the headset down to say something to our coaches. Which could presumably be “you think you’re so f’ing smart” ribbing Manning or something who maybe gave him an “I told you so” about the call. Bottom line, people who have no clue about what goes on on those headsets like to create drama.