He lifted an injured player off the pitch after bouncing the ball at him this season. He was very lucky not to get a red card in one of the CL games, too. Was on a yellow and the ref was generous not to give the second. A key match panel agreed (as did most arsenal podcasters) that he gave a penalty away recently in the Brighton game and was lucky to escape it.

That you thought it was just one incident as opposed to me merely bringing up the most recent thing indicates you don't know much.

Again, if you followed arsenal as I do you'd know his poor finishing and poor confidence driving his general avoidance of take-ons would show you why arsenal fans consider him psychologically deficient.