White Hart Lane vented its anger as Ben Watson's second-half goal saw Spurs slump to a second straight home defeat.
"It was an awful day," Friedel said.
Unwanted Spurs landmarks
Tottenham Hotspur have lost back-to-back Premier League home games for the first time since September 2008
Spurs failed to score at home in the Premier League for the first time since 19 March 2011, this after netting in 29 successive games at White Hart Lane before this match
Source: Opta Sports
"Every single one of us needs to take a long, hard look in the mirror and hold our hands up. We didn't perform from minute one to minute 95," he added.
The American had kept Spurs in the match with two fine saves as Wigan dominated the first half. However, Friedel was at fault as Watson poked in from close range following a corner 10 minutes into the second half and later admitted his mistake.
"It was just a very lacklustre performance by us," he said. "We need to get a home form on track. It hasn't been good enough this season. We will have to go back and look at the video. Normally we have some positives and negatives but I have a feeling this one will be full of negatives.
"This was just not a Tottenham performance."
Spurs boss Andre Villas-Boas admitted his team had put in their worst performance of the season, having coming into this match on the back of five wins in their past six Premier League matches.
"It was maybe our worst performance of the season," the Portuguese said.
"Wigan played better than us. We struggled. It was a game we really wanted to win but we couldn't express our passing today, we couldn't keep hold of the ball. Pity, as it was an important weekend for us to get something before two important away trips."
Delighted with the performance - Martinez
The home support, already angry at their team's showing in the first half, turned on their manager moments after the goal when Villas-Boas took off Jermain Defoe and brought on Emmanuel Adebayor to partner Clint Dempsey up front.
"We understand that they can show their frustrations," Villas-Boas added. "We don't do things to punish them or for the fans to show revolt. We do things for the benefit of the team. They want the win, but we want the win as much as them. We respect them."
Wigan had gone six Premier League games without a victory before their 2-1 win against West Ham last weekend, and their manager Roberto Martinez was delighted with his side.
"The result itself is good enough to make me feel really pleased," he told BBC Sport. "But today it was more than that - it was the performance.
"Some people, who were not at the ground, will think Wigan came here to weather the storm and hit Spurs on the counter, that we were lucky. But it wasn't like that at all. We created three or four very good chances from open play and then we scored from a dead-ball situation.
"The performance was more pleasing than the result today. Keeping a clean sheet at White Hart Lane and enjoying the way we played - it was a perfect performance."
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