Villa were thumped 4-1 at St Mary's.
Bennett told AVTV: "You're going to have ups and downs in football, that's part of the game. We're disappointed now but we plan to move on quickly.
"We're going to the Etihad and not many people are expecting us to win. That can be a good thing.
"That can help, when you don't have pressure on you. Hopefully we can go there and do a really good job.
"Our fans were quality. That's the first time I have seen them. They came in massive numbers and sang all game, which was fantastic.
"It's such a shame they had to leave the game with such a disappointing result for their team."