The Carrow Road outfit conceded all four goals in 16 first-half minutes as Villa recorded their first win in five Premier League matches.
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"We've generally had a side that have been able to pick themselves up after a difficult result to churn out a better result," he said.
"You have to assess - we weren't good enough (on Sunday) and that's a fact and we were well beaten in that 15-minute period.
"It's how you respond to it, and generally we've got a good group of lads that have responded very well, but it's difficult to take at the moment because it's not one I saw coming."
Norwich host Stoke City in the Premier League next Saturday.
Hughton's men are currently 15th in the table and four points above the drop, though have played at least a game more than the three teams directly below them.