I'm going to strongly disagree with this. Our players have over a period of years been shielded by the fans in the stadium.
I appreciate football hipsters consider demanding hard work from your players akin to voting for Brexit, but I think the least you can demand from any football player is they put in the effort. Zirkzee has turned up, dropped stinker after stinker and hasn't even had the common decency to try.
Our fans absolutely have the right to criticise players who take the piss, as Zirkzee has done since he's got here.
I'm glad he apparently cares enough to be upset about it, because nothing about his time at United so far would suggest he cares at all, hopefully if he plays for us again he will remember it and put in some effort. He'll still probably be shit, but that you can't blame him for, not trying you very much can.
On a personal level I feel for him being thrown into a shit show and being severely over promoted, and I think it's best for all of us if we part ways in January, but his own attitude and style are responsible for why people have turned on him.