Wolves left Wales with a slender win after Cardiff failed to capitalise on winning two late penalties after Ruben Neves had broken the deadlock with a fine free-kick in the 67th minute.
Gary Madine saw their first spot-kick saved by John Ruddy in the second minute of stoppage time and Junior Hoilett then put his penalty effort onto the crossbar a few moments later, sparking wild celebrations amongst the Wolves coaching staff, which did not go down well with Warnock.
The 69-year-old manager could be seen repeatedly shouting expletives at his counterpart as Nuno followed him in an attempt to shake hands.
The former Valencia tactician later apologised on television for his celebrations and said he intended to say sorry face-to-face in Warnock's office, but he might struggle to find him.
"I don't accept it [the apology] at all," Warnock told Sky Sports. "I think it's out of order and a total disgrace. He's got to learn in British football you have class and manners.
"That is why we love the game" pic.twitter.com/C7QoHzVbXM— Wolves (@Wolves) April 6, 2018
"I don't think I'll go in my office until after he's gone. I don't want to see him. I didn't want it to end like that."