The difference between Hojbjerg and JWP playing out of position, is that JWP knuckles down and does the best he possibly can, whereas Hojbjerg attitude last night appeared to be: "pah... This isn't my position... I'm going to have a mini strop about it"
Yes, it was a seemingly bizarre decision to play Hojbjerg there, but to then not give it your best shot is entirely down to the player's attitude and lack of professionalism...
Imho of course