Rafa Benitez accused his Newcastle players of making “mistake after mistake” as Wolves ended their six-game winning streak.
The furious Newcastle boss saw his side crash to a home defeat – four days after winning 6-0 at QPR.
Benitez denied that his men had got complacent after being lauded in midweek, but conceded: “It is difficult to manage when you have so many things wrong.
“We gave the ball away too easily and made wrong decisions."
Benitez, whose side were on a six game winning streak, added: “We started making mistake after mistake. After the own goal it was even worse.
“We gave them the chance to believe. The second goal, another mistake. We made too many. That is why we lost the game.
“We are not very happy now. I don't think the players got carried away with winning 6-0. they knew. It was more about the football decisions. They were wrong and we put ourselves under pressure."
Wolves perfect away performance ended in Icelandic striker Jon Dadi Bodvarsson the 'thunderclap' in front of their 3,200 fans.
An own goal from Chancel Mbemba and a second-half strike from Helder Costa grabbed the points.
Newcastle suffered one final humiliation when Vurnon Anita was sent off for an over-the-top late tackle on sub Ivan Cavaleiro.
Walter Zenga said: “I am delighted because I got my answer from the team. We wanted to show the last 15 minutes in the last game was an accident. That was a shock for everyone.
“The spirit, how we started the game, how we played is a big plus for everyone. Playing in front of 52,000 fans against a team on five wins in a row, not conceded for four games, last game 6-0 for them, 4-0 against us.... the approach was very important.
“We had to give something back for the fans.
“The players believe in what we can do. New manager, new players. It is not easy to put everyone together and you can have ups and downs. We just have to believe.
“It is difficult to find a player who didn't give 200 per cent. Running, tackles, a great match.”
Newcastle's decent defensive run came to a self-inflicted end. They had not conceded for 525 minutes when Bodvarsson broke down the right and fired in a dangerous cross.
Mbemba miss-timed his clearing header and planted it past Matz Sels to give Wolves the lead after 28 minutes.
They had a second after 62 minutes – this time a beauty from Costa.
The Portuguese winger helped force a mistake from Ayoze Perez, then skipped forward and curled home left footed from 22 yards.