Lincoln City manager David Holdsworth accused his players of a lack of fight in their 3-1 FA Trophy second-round replay defeat by Carshalton Athletic.
Striker Paul Vines scored a hat-trick as the Isthmian League side dumped the Imps out of the competition, with Jake Sheridan netting a late consolation.
Holdsworth told BBC Lincolnshire: "I'm embarrassed by that performance, it was woeful. There are no excuses for that.
"I'll gladly apologise to anyone because that wasn't good enough."
Vines put the Robins ahead from the penalty spot after 39 minutes and made it 2-0 three minutes later, beating keeper Joe Anyon to a free-kick and heading home.
He completed his hat-trick 11 minutes into the second half, before Sheridan's 89th-minute reply.
"The lack of desire from some players was inexcusable," said Holdsworth. "Players need to take responsibility.
"They need to look at themselves because when they cross the white line they need to have that hunger. I'm afraid that tonight some of them have no place to hide.
"I won't defend that kind of performance. They need to look at themselves, as we all do, and I need to have more character in the side because we were woefully short of leaders."