Dundee boss Neil McCann blasted his players after an “appalling” finish at 10-man Kilmarnock saw them throw away a 2-1 lead.
Sofien Moussa’s penalty had sent the Dark Blues in at half-time level following Eamonn Brophy’s early opener.
Dundee were on top and deserved the lead when Steven Caulker smashed in a goal on his debut after 56 minutes.
Gary Dicker was then sent off for a poor tackle on Roarie Deacon but that didn’t stop Killie, who battled back through Kris Boyd and then snatched victory with just three minutes to go with Iain Wilson’s run and finish.
Before that, though, the Dundee gaffer felt Glen Kamara was upended in the middle of the park.
He said: “I thought it was a clear foul on Kamara but it wasn’t given.
“The closest player was Mark O’Hara who couldn’t bring him down as he’s on a yellow. He could take one for the team but then we’d be down to 10 men.
“But Wilson waltzed through the middle and stroked it away so it’s quite appalling to lose a game when you are a goal up and a man up.
“I can’t fathom what goes through players’ heads at times about managing games.
“I make a substitution to take Roarie off who had suffered quite a heavy knock due to the red card.
“I put on Cammy Kerr to be a wee bit more defensive to try and manage the game, to try and force them out, there was no need (to force it) we were a man up.
“Keeping the ball is alright if it’s done for a reason but, when we were 2-1 up, at times keeping the ball we didn’t do anything other than keep it through the middle, we were passive with it and allowed Kilmarnock come on to us.
“The second goal was appalling. No professionalism in terms of getting into a shape, there were people running out of position and that created the space that Kris Boyd lives in.
“It was a super finish but he shouldn’t have had that space.”
The defeat leaves Dundee in ninth place, now seven points behind Motherwell in that coveted sixth spot.
“It was a great opportunity, there with three points in your hand and we were within touching distance of the top six again,” Neil added.
“I’m still raw just now. I’ll be thinking about this for a long time.”