Mark Cooper refused to comment on referee Steve Rushton for fear of being fined after Swindon were held to a 1-1 draw by Crawley.
Cooper saw his side's play-off hopes suffer another blow as Crawley striker Matt Tubbs bagged a late equaliser to cancel out Nathan Byrne's strike.
Cooper said: "All I'll say is this one tops the lot from what I've seen so far.
"If I want to get fined £5,000 I can go and have a shout at him and write a letter and they'll say thank you very much Mr Cooper and I'll have to pay £5,000 to the FA."
Rushton waved away several strong challenges and also denied Crawley what looked a clear penalty in the first half.
This point means Cooper's side have now won just once in their last eight matches, denting hopes of a top-six finish.
Cooper said: "When you're one nil up with 10 minutes to go and you have a chance to win the game and then 10 seconds later it's in the back of our net, it's very frustrating.
"I thought we did okay until we got to the final third of the pitch and if your strikers don't hold the ball up you struggle to get anything going.
"Our possession was too slow. We didn't switch the play quick enough and for me it was down to our forward players not getting hold of the ball."