He really is. He simply hasn't grown up. Remember when he went nuts after he lost in the Super Bowl? He left the conference. Just super immature. He was so convinced he was getting a Ring and when it didn't happen, he had no clue how to handle the loss. He has ups and downs... when they lose he's miserable and snappy, when they win he's on top of the world and arrogant. There's no balance with him. He was feeling relaxed and happy since they just won and the arrogance and lack of filter just came alive with the sexist comment.