Boston United joint-boss Lee Canoville blasted his side's defending following their 6-1 defeat by Altrincham in the Blue Square Bet North.
Damian Reeves netted a hat-trick for the hosts as the Pilgrims fell to their heaviest defeat since February 2007.
"To let in six goals at any level is not good enough," Canoville told BBC Lincolnshire. "I'm devastated that we defended so badly as a team.
"We looked like we didn't know what we were doing and it was embarrassing."
Canoville admitted that the scoreline could have been worse, were it not for the efforts of Pilgrims goalkeeper Paul Bastock.
"Bazza's pulled off some good saves out there," he said. "It could have been more which would have been even more embarrassing and we've got a lot of work to do to put it right."
Reeves netted the opener on 14 minutes, turning home a cross from James Lawrie, who netted the second after 27 minutes.
Reeves extended Altrincham's lead less than a minute into the second half before Jason Lee reduced the arrears in the 65th minute.
But 10 minutes later Reeves completed his hat-trick, with goals in the final six minutes from Michael Twiss and Astley Mulholland completing the rout.