Morecambe boss Jim Bentley apologised to the club's fans after their FA Cup replay loss to Dagenham & Redbridge.
Bentley's side led the first-round replay 2-0 early on, but the Football League's bottom club fought back to earn their first win in eight matches.
"It's soul destroying and I can understand the fans' frustration," Bentley told BBC Radio Lancashire.
"I could go as far as saying I can understand them calling for my head after that, because it was that poor."
The Daggers will now host National League South side Whitehawk in round two.
"We knew where the path was with regards to (reaching) round three," 39-year-old Bentley said.
"We had to get through tonight and then another game against a National League South side who are doing well - it would have been a tough game, but it was all set out for us.
"They got back to 2-1 and then after that I thought we lacked fight, lacked leadership. All I can do is apologise to the fans. What an absolute disaster."
Morecambe, who are currently 13th in League Two, travel to Barnet on Saturday.