Joint manager Lee Canoville blasted Boston United's defending as they were held to a 2-2 draw at Eastwood Town.
The Blue Square Bet North strugglers led twice through Francis Green and Jevaise Christie, with Ian Ross and Marc Newsham on target for Boston.
Canoville told BBC Lincolnshire: "It was schoolboy stuff. When you concede goals like that it's hard to win games no matter who you're against.
"We gave away two sloppy goals and it feels like we've had a heavy defeat."
Eastwood went ahead on 11 minutes when a shot from ex-Pilgrims striker Green, who also scored twice against his former club on Boxing Day, took a deflection off Tom Ward to beat keeper Paul Bastock.
Boston levelled seven minutes later through Ian Ross's free-kick, but the Badgers regained the lead in the 24th minute when a dreadful back-pass from Pilgrims defender Jordan Fairclough left Bastock stranded and Christie had the simplest of tap-ins.
The Pilgrims' pressure after the break eventually paid off when Newsham scored his 10th goal of the season from Ryan Semple's cross.
Canoville said: "We found ourselves chasing a game that we should have been dominating.
"We're disappointed to come here and not get the three points but in some ways that's a sign of how far we've come, we're expecting to win games.
"I know they're near the bottom but no game in this league is easy. In one way I'm pleased that we haven't lost but it does feel like a defeat."