Wasps coach Shaun Edwards declined to criticise Greg Garner after the referee showed three of his players yellow cards in the 26-15 Aviva Premiership home defeat by Saracens.
But Edwards' reluctance to berate the official could not hide the frustration aired so forcibly by home fans after Garner sent forwards Marty Veale, Tim Payne and John Hart to the sin-bin.
Wasps conceded 12 points while they were below strength and Edwards reacted to the yellow cards by telling the after-match press conference: "Obviously they were costly - but did we deserve them? It will be much better for me to keep my thoughts to myself otherwise I'll get in a lot of trouble. I'll keep my silence. You saw it, you write it."
Edwards was less reluctant to talk about Wasps' failure to adapt to the conditions at rain-sodden Adams Park, where Saracens won for the first time in their eight visits.
Sarries' flanker Andy Saull scored the game's only try after three minutes and Edwards reflected: "We started horrifically and in the second half we were outsmarted by the opposing half-backs.
"Their kicking game was much more clinical than ours and it was pretty obvious we are a much better team in the dry.
"We showed a lack of nous in those conditions which our opponents didn't. They were very smart and intelligent with their kicking game."
Edwards also criticised his side's tactics as they tried to rescue the game in the closing stages.
He explained: "We went for a scrum when we were down to 14 players, which I found a peculiar decision.
"It's not a case of me shouting and screaming at anybody because everybody's obviously given 100% effort. It's about trying to educate players to make the right decisions at the right times."