Everyone should condemn this threat whatever you think of him as a referee.
But are the individual refs the issue personally i don't think so. IMO the issue is the system that allows them to continue IF they are not up to it. There is enough video evidence around and surely stats are collected.
Now putting my conspiracy cap on , possibly the more contentious decisions become then the more likely the TV audience to react and increase interest in the televised game. I am quite sure there are plenty of armchair, sort of neutral football fans who love VAR.
The PGMOL is a closed shop with seemingly no accountability. Referees never admit mistakes and never explain their reasoning and that is all down to the poor leadership.