Richie Barker refused to defend his Crawley players after throwing away a two-goal lead to lose 3-2 to Newport in the JPT.
The game turned in a six-minute spell either side of half-time after Emile Sinclair and Mike Jones' stunner had given the Reds a 2-0 lead.
Chris Zebroski tapped in a cross by Robbie Willmott to give Newport a lifeline and three minutes after the break James Hurst pulled back Danny Crow inside the box as he raced through and was shown a straight red card.
Adam Chapman made no mistake from the penalty and Newport's fightback was completed on the hour when Willmott's cross was sliced into his own net by defender Connor Essam.
Barker was fuming with his side's display and said: "I normally defend my players but I can't do that this time. I made changes but what the performance showed is that I have been picking the right team for the last six weeks.
"Not too many of those who came in did themselves any favours. I didn't really see the penalty incident but there weren't too many complaints by our players.
"To be fair, after we went 3-2 down we threw caution to the wind a bit and their goalkeeper made some terrific saves. But the damage had been done."