The bumper crowd weren’t treated to an improved performance as Pools went down 2-0 at home to Wrexham.
The player who undone Harrison was one he coached in Wales before moving to England.
Scott Quigley was at the double - and it mean out-of-form Hartlepool are just six points from the bottom four.
Harrison told the club’s official website that the “unbelievable” support deserved a lot better as they slipped to a fifth defeat in seven National League matches.
“Again we gave two terrible goals away at a time when we were on top of the game and we’ve done that quite a few times this season,” he said. “We’ve just been too soft.
“Wrexham are an experienced and well-organised team and they game-managed from minute one but we knew that was going to happen.
“The support was unbelievable from Hartlepool fans and football fans in general – they deserve all the credit in the world and they deserved a better result than that.
“Confidence is low and there’s a lot going on but we can’t have any excuses and the last thing we can do at the minute is feel sorry for ourselves.
“We need to dust ourselves down; we’ll be in training on Sunday now for a cooldown and some match analysis so we will get organised to ready go and win at Chester because we need to kickstart our season.”