The Leesiders' boss has bemoaned his side's mental frailty after they were knocked out of the Setanta Sports Cup semi final after conceding a late goal
The Leesiders were on course to qualify for the final of the competition until Billy Dennehy struck in the final minute to bring the score to 2-2, handing the Hoops the aggregate victory on away goals.
And City boss Dunne believes that his players only have themselves to blame, for "doing stupid things" during the game.
"I don't think it's a case of us being negative at any time," he told the Irish Examiner. "I keep saying this: That teams when they're behind are just going to lump it into the box. We dealt with that the other night but then you give away a soft free kick. And that one kick of a ball costs you."
He added: "We're doing stupid things. What we're doing is, we're giving every team an opportunity — it's up to them to take it, and they're taking it."
Dunne acknowledged that the trend of conceding late goals was becoming a serious problem for his side, but was keen to put the loss behind him and focus instead on forthcoming league fixtures.
"Everybody’s sick of it," he said. "The supporters are sick, but we're all sick and, to be truthful now, it's in the past.
"We have Dundalk on Friday [April 26] now. It's a tough game, but every game is tough and we have to start winning."
Meanwhile, it has been confirmed that Tallaght Stadium will host the Setanta Sports Cup final between Drogheda United and Shamrock Rovers. The final is set to take place on Saturday, May 11.