Widnes boss Denis Betts was furious with referee Robert Hicks after his side's 22-22 draw with Bradford at the Stobart Stadium on Friday.
Hicks dismissed Vikings second rower Gareth Hock for dissent on the half hour, but the hosts nevertheless produced a rousing second half performance to fight back from 20-4 down.
Betts saluted his side's efforts after the interval but was unimpressed with Hicks.
"It was an atrocious decision and an absolute joke," Betts said of the decision to send off Hicks for dissent after Matt Diskin bagged the Bulls third touchdown to stretch their advantage to 16-4.
"It was a very poor decision and a player should not be sent off for swearing. Are we in a schoolyard? You shouldn't get sent off for swearing. Maybe warn him or a sin bin but not a sending off. It's very frustrating."
Widnes scored three tries without reply in the second half with a Patrick Ah Van penalty five minutes from time earning a point.
Betts said: "It was an epic second half and a great performance of endeavour and enthusiasm.
"We could not get a grip on the game at first but got stronger and had great self-belief. We fought as hard as we could and even had opportunities to win it."
Bradford coach Francis Cummins said: "You can't play without the ball and we couldn't put any pressure on Widnes in the second half.
"We had a few guys busted and the penalty count was surprising - but no excuses.
"I cannot fault my players for their effort but it was an awakening after Sunday's good result over Huddersfield."
Cummins also revealed three injury concerns, with Jamie Langley suffering a groin injury and Matty Blythe and Chev Walker picking up ankle problems.