The Black Cats came close to a shock win at Old Trafford, but an late own goal by Anton Ferdinand made it a draw.
Bent opened the scoring in the 2-2 draw.
“(I’m) really disappointed,” Bent told ESPN. “I thought the boys played really, really well.
“We worked really hard.
“You know what Manchester United are going to be like at home, they’re going to come at us, come at us, come at us.
“It’s a good point in the end because if you come to Old Trafford and get anything you’ve done well, but obviously we’re dejected not to get all three points.”