It is hard to say, Did Lee Probert have some banter with him during the game? Was there a comment made buy either before it happened? We don't know for sure.
I know Lee has a great sense of humour, either last season or the season before he got floored in a tackle and whilst getting treatment jokingly showed a red card to the player. So he would brush it off with a smile. But on a Sunday morning match its a bit different. I personally would have to judge it on its merits if I had been having some banter with the teams and players I would brush it of with a smile like Lee did, but on the other hand if it was a fired up game where players are moaning like hell I would almost certainly act on it with a card.