Irish referee Alain Rolland had adjudged his tackle on French wing Vincent Clerc to be dangerous and it was the end of the flanker's and Wales' World Cup hopes as Les Bleus ran out 9-8 winners.
But Warbuton, who now misses the third-fourth play-off with Australia in Auckland on Friday after being banned for three weeks, has come out fighting, adamant the decision to show him a red card was harsh.
"I'm obviously gutted, but there was no malicious intent," he said.
"I felt like as soon as it hit him his bodyweight took control of what happened.
"I thought it was a normal tackle, next thing I was walking off into the stands.
"The courage and bravery the lads showed was second to none."