Warnock used his post-match press conference as a platform to fight Fraizer Campbell's corner.
A one-time Hull loanee, he was booed relentlessly by the home fans having twice turned down a permanent move.
But Warnock was more annoyed at a perceived lack of consistency from referee Mike Dean.
"I had to take Fraizer Campbell off because he got a silly booking but in the first minute he was body-checked, which should have been a yellow card," he said. "Then just before half-time, there's an elbow from (Michael) Dawson - I've seen red cards for less than that.
"The referee doesn't see that but he sees all the little niggles that poor old Fraizer gets booked for.
"Referees should be in a position to see elbows like that and know it's not an accident. It's dangerous play.
"They need to be educated better, even though he's one of our better refs."
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