Derek Adams slammed the manner of the goals conceded by City, as they fell to a 2-1 defeat in injury time to Crawley Town.
Two second-half goals from the Reds condemned the Bantams to their second league defeat of the season.
Adams insisted that it was the manner of the goals, rather than the goals themselves, that frustrated him the most.
He said: “The way we lost the goals, the manner in which we did not defend our back area, it is not the first time it has happened this season.
“We should not have been in that position. We should have seen it out. We should have been 2-0 or 3-0 up.
“To lose the goals we did, with two long balls into the box, was really poor from us. That is when you need your players to stand up and deal with long balls.”
“You cannot keep moving backwards, you need to move forward.”
The City boss highlighted the importance of individual performances, as well as a strong, unified showing, when chasing victory.
Adams insisted that City’s inability to secure a point or all three was due to his side's failure to do their own individual jobs.
He added: “As a manager, it is difficult because you are dealing with individuals as much as you are a unit.
“If players do not do their own jobs, there is nothing a manager can do.
“We have changed players this season, taking them in or out because of individual errors.
“There were two big errors today.”