Garry Monk has told his Swansea City players to learn "harsh lessons" as they fell to their first home defeat this season against Manchester United.
Javier Hernandez's winner inspired the defending Premier League champions to a win as Swansea suffered their first Liberty Stadium loss in nine months.
"We gave them a little bit too much respect," said Swans captain Monk.
"Second-half we proved to ourselves that we can play against these teams but first-half wasn't good enough."
The newly-promoted Swans were one of four teams with unbeaten home records before Saturday as wins over West Bromwich Albion, Stoke City and Bolton Wanderers followed draws with Wigan and Sunderland.
But Swansea were punished by a "ruthless" United side as Ryan Giggs capitalised on Angel Rangel's misplaced pass to set up Hernandez in the 11th minute.
"Any mistake is disappointing but we'll all share the blame as we all make mistakes," said Monk.
"You make a mistake and you get punished in this whereas they made a mistake and we didn't punish them. We have got to learn quickly."
Scott Sinclair had a great chance to rescue a point for Swansea but the unmarked winger failed to convert Wayne Routledge's first-half cross.
The third successive victory for Sir Alex Ferguson's team's kept the gap on league leaders Manchester City to five points as United won in Swansea for the first time in their history.
But Swans boss Brendan Rodgers admitted: "You or I could've played for Manchester United in the first-half.
"I think we were a wee bit in awe which I can understand. My players have grown up watching these players.
"We didn't press how we wanted to press. We were a little bit standoffish. Manchester United were too comfortable.
"In the second-half we were more like ourselves and showed the courage like we'd shown all season.
"And when we do that we're a real threat and we can play against the top teams."
Centre-back Monk agreed that Swansea must not allow top teams, such as Champions League runners-up United, "too much respect."
"It was a harsh lesson," said Monk. "You have to come out of the traps better against the bigger sides.
"In terms of budget and stature we're a million miles away from them but in terms of desire and effort we match them in every department - and that showed in the second-half.
"A number of people would have had us down for a four or five nil beating even though we have a good home record.
"If we're anywhere near our best, we'll give anyone a good game and we did that second half so that will have to be a precedent for the rest of the season."