I don't think dropping him for that reason is necessary, and I don't think that's why he was dropped. If there was an issue with his arrogance then dropping him might be the way to get through to him but I don't feel like that is the case. He has worked hard to become good in that position and was expressing himself Confidently, which is an important Component of attacking backline play. I think he would have learnt on his own without being dropped.