Gary Bowyer labelled his side’s performance “unacceptable” following City's 4-1 defeat to Blackpool.
Despite making a bright start to the second half, the Bantams conceded a further three goals in the latter period.
And Bowyer was left with a late David Ball goal as mere consolation.
“I cannot accept that last 20 minutes,” stated Bowyer.
“I am not about that and am certainly not having my teams about that.
“Sometimes you can lose games through ‘worldies’ flying in - and you have to take your hat off.
“The second goal was a fantastic strike but was easily preventable.
“We worked on stopping crosses and conceded from two which have gone in. The man was left unchallenged both times.
“I thought we came out second half, to be fair, and had a bit more of a go. Their goalkeeper had two or three great saves to make.
“We tried to encourage them to shoot more and take more responsibility. We were on the edge of their box but didn’t take the opportunity.
“The chance broke down and they went down the other end. They had a shot and it flew in the bottom corner.”
Blackpool goalkeeper Christoffer Mafoumbi saved an Eoin Doyle penalty on 53 minutes to prevent any hope of a Bantams fightback.
But Bowyer insists his players have been made well aware of his thoughts for what followed.
He added: “We got the penalty which changes the game, if it is 2-1.
“Their goalkeeper made another very good save. After that moment, I am not having it.
“We have games left to fight, to show pride – individually and collectively – and pride for Bradford City.
“I have made the players very well aware of that. It wasn’t shown in the last period of the game.
“It was my fourth game. In the previous three games, I didn’t see it.
“Blackpool obviously had extra motivation today with me being in the opposite dugout, but I am not having it.”