I'm all for berating him on here (and others who deserve it), but it definitely shouldn't spill into the ground. The players need supporting.
He's the on field symbol of Koeman's pig-headed stubbornness and refusal to acknowledge he's wrong and change for the benefit of the team. The venting inside the stadium is directed more at Koeman than it is him.
He's still a crap fat tit head like.