Hibernian manager Colin Calderwood hit out at his team after they exited the Scottish Communities League Cup, despite holding a 1-0 lead at half time.
Celtic fought back to claim a place in the last four with a .
"We're on the edge of lunacy," Calderwood told BBC Scotland.
"You can be as critical as you want. It's a man's game and you've got to play like a man."
Hibs got off to a perfect start when Celtic defender Daniel Majstorovic deflected Ivan Sproule's shot into his own net in the fourth minute.
Celtic were level 90 seconds after the break following a magnificent strike from James Forrest, who grabbed the second goal in the 58th minute.
Anthony Stokes headed in the third and Gary Hooper fired home the fourth before Sproule was sent off for his second bookable offence in the 71st minute.
"We didn't play sensibly," Calderwood added.
"The timing of the goal and the way the game just went away from us, we should be able to defend much better and it is as disappointing as it is disturbing.
"I think we spurned an opportunity for a big result and it is very frustrating.
"At 2-1 down you're still in the game, but we didn't pick up from a throw-in, we didn't pick up from a corner.
"We've let the air out of our own balloon today. We didn't make good decisions.
"From excitement and anticipation to get yourself deep into the second half, the goals got the game level far too quickly.
"But after a throw-in and a corner we're more or less out of the cup tie because we didn't get back to what we did in the first half."