Chris Wilder was frustrated his side didn't claim three crucial points against play-off rivals Millwall at Bramall Lane on Saturday afternoon.
Leon Clarke's 18th of the season looked to have given the Blades a second consecutive home victory, but Steve Morison levelled for the Lions straight from the kick-off following Clarke's opener, much to Wilder's annoyance.
He remarked: "I suppose in the end it was a fair result.
"We couldn't find that quality and when we did we weren't clinical. The goal we conceded was a poor one to give away, especially having just gone in front.
"It was a tight game and we felt there was only go to be one goal in it, so we have to make sure we defend long balls.
"It's not a defence splitting pass, it's basically a punt of Cooper's left boot and it should be dealt with, but it isn't and it's a good finish."
Wilder added: "The atmosphere in the stadium completely changed in a matter of seconds, from seeing the manager running down the touchline celebrating to knowing we've switched off and being punished.
"We're conceding poor goals and it's proving costly, we're not getting cut open, we're just conceding bog standard goals that would be disappointing in any division."