Goals from Bruno Andrade and Matt McClure secured the visitors a comfortable three points despite McClure being sent off for two bookable offences in the 55th minute.
Stanley conjured up little and stuttered to their third successive league loss.
"It was poor, lacklustre and not enjoyable," said Richardson after his 11th game in charge. "It's the worst we have been. I am fed up with saying the word frustrated.
"Before I took over and after I took over, I can't remember a performance like that. We wanted to start positive but we were chasing the game early on and then we never got going.
"Only Rommy Boco came out with any credit. The players know in no uncertain terms how I feel and as a group it's not good enough.
"We seem to be in a mode and, even when they went down to 10 men, we couldn't change our game."
- Sports & Recreation