Preston boss Alan Irvine admitted afterwards it was a "definite penalty", which did little to ease Warnock's disappointment.
Warnock said: "Alan has seen it, hasn't he? He's not daft. Lonergan came down the tunnel and said it was a penalty so what can you do?
"When you talk about respect, officials have got to learn respect.
"I expect officials to see something as blatant as that. It's not just one arm, it was two arms in the back of him, and I could see it on the halfway line.
"You've got to be strong and know what you're doing as officials. I feel bitterly let down because a sad day. If we had got the penalty we would have been in the ascendancy because they created nothing and didn't hurt us.
"I never felt threatened by them but once again the major decisions have hurt us. Even in the build-up to their second goal, the referee missed a handball from Paul McKenna."



