Pretty much everyone appeared to chuck the towel in after the penalty. I thought Bellerin was the worst. A couple of times he was stood in the box making no effort to reach a loose ball at all. Noticed Elneny do the same.
I doubt it is much more than a lack of confidence and morale in the dressing room. Unfortunately, none of it will get addressed as Wenger will focus on the penalty. The truth is it is our reaction to the penalty that cost us the game. Wenger sulked, so did the players.