The Leeds centre-back took to social media after a 1-1 draw with Bolton.
Indeed, a performance many saw as United's best of the season only brought a 1-1 draw at Fulham on Wednesday night.
And that was followed up by a 1-1 draw at the Championship's bottom side in Bolton Wanderers. The consensus among both manager and players appears to be one of disappointment and that the Whites missed a big opportunity to seal all three points.
Cooper subsequently took to Twitter with a message to the fans and a declaration that Leeds must do better. He was venting his visible frustration.
Safe journey to all that travelled! Boys are gutted. Should have 6 points from them 2 games! HAVE to start winning! #MOT— Liam Cooper (@LiamCooper__) October 24, 2015
In reply, Leeds fans produced a variety of responses.
But an overriding theme was the fact United simply have to cut out the mistakes at the back. One man stood out in particular in this area: goalkeeper Marco Silvestri.
The Italian has frustrated sections of the Leeds faithful throughout his time in Yorkshire and there is no denying his tendency to err under pressure, even if he is a brilliant shot stopper.
Here's a selection of how Leeds supporters responded to Cooper's tweet...
@LiamCooper__ very true skip. We go again next home game .. We all love Leeds we all love Leeds..... Love your passion— Miles Mercer (@milo1403) October 24, 2015
@LiamCooper__ can't be very reassuring knowing flappy is in net— lufcmatt (@Mathew1982) October 24, 2015