Robinson accused Cummins of being “horrible” and “disrepectful” to his players in his post-match press conference and now ARL Commission chairman John Grant has returned serve at the coach.
“It is very disappointing and obviously orchestrated, from a misplaced and spurious belief it was the referees fault,” Grant told media.
“It is ridiculous. The referee didn’t lose the game, the Roosters lost the game.”
Robinson slammed Cummins and the use of the bunker in Monday’s match.
“Ben has been horrible and disrespectful to our players for many years and it has continued,” Robinson said.
“He speaks poorly to our players. He won’t look them in the eye. The bunker has decided to be the on-field referee today, they jumped in at every occasion, they are not the match review committee.
“It was just soft on Anzac Day. We want to play a tough game and they were soft calls coming from the bunker, they were not good enough.
“I am not saying we would have won, I am saying we should have had a chance to win.”
Robinson is expected to cop a fine from the NRL for his outburst and the Roosters are under investigation into an alleged altercation between club stuff and match officials in the tunnel after the Dragons game.