The Cherries went through a long period of the game with an extra man, when Richarlison was sent off for Everton.
But they could only manage a 2-2 draw in the game, having to come from behind.
He told the Daily Echo: "I was just disappointed in the end. We had 11 versus 10 and we just didn't do it right, it was as simple as that.
"We always work on it in training and then we went out and did that. We gave ourselves two goals to come back from again.
"It's good character but we shouldn't have to keep doing it. You have to take the positives but we shouldn't be putting ourselves in that situation.
"At 0-0 with 11 versus 10 you have to go out and do the right things quickly. The first thing we did was just not right.
"They got a stupid goal to concede. We had a man sent off as well. Smudge (Smith) was unlucky but overall it was just not good enough.
"I would say we had been defending better this season but, after Saturday, it was probably not the case."