Chris Wilder was keen to stay up beat following Tuesday's harsh defeat against Aston Villa.
Robert Snodgrass produced a moment of quality at the death to cruelly deny the Blades a point, which was the very least the performance warranted.
And Wilder acknowledged his side's effort, he remarked: "There have been a few of those this season, Bristol City, Villa and a couple more, so it's bittersweet really.
"We're going toe-to-toe with teams who shouldn't really be in the Championship, they've got quality players throughout their team.
"Their goalkeeper was outstanding and is a fantastic young stopper and they've got an international player who has played in the Premier League who scores a fantastic goal to win them the game."
Wilder added: "We're talking top end Championship football and unfortunately we've not had that bit of luck we needed to win the game. But I shouldn't be too critical and nobody else should be really.
"Aston Villa are a giant in this division and really should be in the league above.
"We dominated the first-half and the only disappointment is we gave the ball away a lot after the break and it was a much more even second period.
"People will write us off again now, but that's OK, there is still plenty of life in us. We're proving that in our performances, we're on the front foot, energetic and really going for games."