The Cod Army staged a second-half fightback to win 2-1. A Jamie Cureton goal handed the hosts the half-time lead but Antoni Sarcevic levelled from the penalty spot shortly after the break before Josh Morris drilled home the winner.
"Words fail me. Scotty Brown hasn't had a save to make all game and we've lost," said Yates.
"It was a soft penalty to give away. Matt Richards should have dealt with it better - his decision making was poor. But I still didn't think it was a penalty.
"But we have done what we have been doing all season - thrown away a lead. I apologise to the supporters for the way that happened but the overall performance for 50 minutes, until we shot ourselves in the foot, was pretty good.
"I am not going to hide behind anything - we have found another way of losing from a winning position."