Swindon manager Paolo Di Canio blasted his player's mental approach after slipping to a 1-0 defeat at home to promotion rivals Brentford.
Clayton Donaldson's volley 13 minutes into the second half was enough to earn the in-form Bees a win to take them level on points with Di Canio's sixth-placed Robins.
The Italian fumed: "I am angry simply because without doing something special we were on top of the game and three or four of my players didn't perform because they have a very average mentality.
"We have players with a snobby attitude sometimes because they win one game then they fly away and do not recharge. We play attacking football and are not capable of taking our chance because four or five are not ready.
"It was a difficult game and I am not happy but they had one chance and were ready to take it. We must work harder - each player - and we need to toughen up. We have to work on some of the players' mental approach and we can do much better.
"We didn't create a lot straightaway, but in the last 15 minutes of the first half we created chances and the only team that should win was Swindon. At the end the result is, you lose."
Brentford boss Uwe Rosler was delighted his game plan to frustrate Swindon had paid off.
The German said: "We've done well. Swindon are a very good team and I saw them hold Sheffield United in a good performance.
"We held our shape well in the first 20 minutes and Swindon's best chance came when our goalkeeper was fouled.
"We knew we had to do more in the second half, worked hard for 15 minutes and then went 4-4-2 and got exactly what we wanted as we restricted Swindon to the long ball game. I believe we can beat anyone in this division."