Chris Wilder pulled no punches when analysing United's cup exit at the hands of Barnet at Bramall Lane on Sunday.
The Blades boss remarked: "I've not really got a description that is bad enough to describe that performance.
"I won't take anything away from Barnet though, they were outstanding in every department, we weren't second best, we were fourth or fifth best across the pitch.
"We needed to change the team. The players that have got us to third in the table have put an unbelievable shift in throughout the Christmas period and we should have had enough to get through this tie."
Wilder added: "But the players were arrogant in their play, went off plan and played as individuals, deservedly we got knocked out of the cup and I don't buy into the rubbish about the cup being a distraction.
"We pride ourselves, I have done since walking through the door, on turning up, whether it's a pre-season friendly, a league game or a cup tie, unfortunately the players decided not to.
"Our identity went right out of the window and I'm not just going to brush this one under the carpet.
"I feel let down, disappointed and angry. I thought Barnet were outstanding, I've worked at that level and I knew what was coming. I knew they'd bring their best, compete and be a handful."