Despite going down through a Kieran Richardson strike, the home side were buoyed by Sebastian Larsson's missed penalty, as a Steven Fletcher brace overturned the deficit.
Whilst McCarthy's men haven't enjoyed the best relationship with the club's supporters in recent weeks, the Irishman was quick to praise the role of the home crowd in last weekend's win.
He told the club’s official website: "I think Sunday's win came as a result of all that support and good feeling and positivity in the stadium.
"Had any of them turned on me, the players or the club, or if the atmosphere was gone, we'd have lost.
"But they didn't and they were brilliant - even at 1-0 down. And that's how it should be - win together, lose together, draw together.
"I'm cool with it [criticism] being dished out at the end of the game - if we've lost, I've always said they can stay behind and boo me, shout what you want.
"But they need to stay with us during the game, and they created what we did on Sunday. Our fans deserve a pat on the back for that. It was brilliant, I loved it.
"If Sunderland had have scored the penalty, we'd have lost another home game. But the whole atmosphere in the ground enabled us to do it."
Earlier in the season, Wolves found themselves two goals down to Swansea at half-time, prompting a negative response from the stands, and whilst the McCarthy's side managed to secure a point that day, the 52-year-old has compared the difference between the two games.
"When I criticised a certain section of the fans for turning on me and the players, I said 'if the cap fits, then let's wear it', and I meant it for what happened in the Swansea game,” he said.
"But we saw the other side of it on Sunday because I thought they were amazing. It just shows you, and this has to be the message on a good day like this, that positive atmospheres create positive results.
"More people thinking good things about the team create good things. And I thought from the first minute on Sunday, they supported us.
"There was no bleating or bickering, and at 1-0 down, they could have easily turned."