The Bees manager was left feeling 'mugged' as Ben Tozer scored a last-gasp winner for the Cobblers at Underhill.
"I was sat there thinking if we only get a point that will be a disappointing result, then they go up the other end and we lose the game," he said after a game in which Barnet had led through Ricky Holmes' early goal.
"I'm as disappointed with the result as I've experienced as a Barnet manager.
"The number of goals we've conceded recently isn't good enough and the people whose job it is to stop goals going in have got to look and say it's not good enough."