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Manager Justin Edinburgh was an angry man after Saturday’s loss.
The Gills gave away an early goal and then conceded a penalty which AFC Wimbledon converted.
Edinburgh didn’t get a second-half performance he was hoping for, either, having gone 2-0 down in the first.
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He said: “I’m angry, frustrated and disappointed but yet again we have been the instigators of our own downfall.
“It was an okay start, scrappy and competitive, what we expected. It was physical but we were standing up to it.
“But there were a couple of moments of madness and we are not going to continue to come from goals behind week in, week out. That has been proven.
“We have to run harder, faster and further than we did in the second half. We have to analyse it. It has to be put right.
“I have to take responsibility for the players that I am putting out on the pitch and the team I am selecting. I can’t hide behind it. It has to stop, it can’t keep happening. It is not acceptable.”
Donnelly’s back-pass resulted in Wimbledon’s opener on 19 minutes and Josh Pask conceded the penalty.
Wimbledon’s opener on 19 minutes and Josh Pask conceded the penalty.
Edinburgh said: “The back-pass is suicidal and the penalty the same.”
The Gills boss was again hampered by injuries. Scott Wagstaff missed out with a calf strain and Bradley Dack went off after 12 minutes with a hamstring injury.
He said: “Frustrating is the word because of the injuries and the preparation we have put in and to have to change it too early.
“For periods at Chesterfield (on Tuesday) we knew Dacky was getting into some good areas and hurting them and we expected the same (again). It is continuous and we just don’t seem to get going.”
The Gills finished with 10 men after Rory Donnelly's sending off for gesturing to the home fans, something Edinburgh described as "ludicrous".