Interim manager Wayne Burnett was not at all impressed after Dagenham's 1-0 home defeat to Oxford.
Alfie Potter struck the only goal of the game shortly before half-time as the U's won 1-0 at Victoria Road for the fourth season in succession.
The Daggers missed a couple of excellent chances, substitute Mo Shariff twice failing to find the net when well placed, and are still not mathematically safe from the drop, and a run of just one win from seven games is doing little to lighten the mood.
Burnett said: "There's an acute sense of disappointment among the players, and it's not difficult to see why after a defeat and a game like that.
"Going into the game we felt we were in a good place, but a few instructions haven't been followed and we've been punished by a quality side.
"We prepared hard and looked at lots of different ways in which we might breach them or get behind the defence, but for one reason or another the chances haven't fallen for us
"I know there's only a couple of games left of the season, but we won't be using that as any kind of an excuse.
"We'll keep going at it, giving our all and we'll be striving to finish the season on a positive note.
"I realise some fans won't be feeling particularly positive right now, but they've been terrific for us all season and we all know we owe them a lot."