Warnock told ITV1: "I am absolutely devastated. We played a Premier League team and worked our socks off.
"But their second goal was a disgrace. We have a Premier League referee and we got Mr Massey laughing his head off all afternoon with the flag.
"If you look at it the goalie saves it and it comes off (Nathan) Delfouneso and neither of them wanted to make a decision.
"They (the officials) wait and wait and wait to see which what they should give it. It's a disgrace, he should be banned for weeks should (assistant referee Trevor) Massey. All he can do is smile."
When asked if he had spoken to the officials Warnock said: "They don't say anything do they. They said to come back in half hour after you have calmed down and they say 'we'll have a look at it on the video and get some feedback from our assessors'."
"I thought Villa were outstanding and they had to be to play against us. We were committed and that is a travesty for my lot.
"But we have shown we have a lot of talent and we are a genuine club, it was a great cup tie. It was a great game where we struggled early on but came back well."