Jamie Redknapp let rip at five Arsenal players over their relaxed approach to West Ham's second goal at the London Stadium.
David Moyes' side doubled their lead in Sunday's clash on minute 17 when a quick-thinking Jesse Lingard took an early free-kick.
The Manchester United loanee set loose Jarrod Bowen whose near post effort snuck past Bernd Leno.
Upon analysing the goal, Redknapp highlighted five Arsenal players who all had their back turned, failing to pay attention. And they were duly punished.
The Sky Sports pundit described their error as a schoolboy one that esteemed professionals should not be making.
"When you talk about when you're a kid, one of the first things you learn when the ball goes dead don't turn your back. Look at the Arsenal players there, you can see Tierney, Partey, Xhaka, you can see Mari. Look at the goalkeeper - he never gets himself in the right position," Redknapp said at full-time.
"That is abject. That is what you expect from schoolboys when you talk about football.
"It was a poor piece of goalkeeping as well. But it just summed them up. It's now how you play football. You got to be bright. You need leaders. Take responsibility. That's why they got caught out."
Asked if the goalkeeper should organise the defence, Redknapp replied: "It's a difficult one because he's in a position where he's 20 yards away. It's more the players. It's just something you learn as a kid.
"Every one of them goes to sleep there. Full credit to West Ham. But that summed up the first 30 minutes from Arsenal's point of view."
Gunners legend Paul Merson was also a pundit for the game and was less than impressed with Arsenal's start.
"Five players played on Thursday night. It's not really. It's unacceptable," he said.
"You're playing for Arsenal, you can't start like that. You can't start a Premier League game like that anymore.
"They got punished but fair play to them. I can't talk highly enough about them how hard it is to come back from three goals down. They showed a lot of spirit. I know Antonio hits the post but fair play to them.
"If they want to get into the Champions League next season they need consistency. You can't play 45 minute football."
