“The first thing that springs to mind is whether you lose by a run or a defeat like that, it is one loss at the start of a very long tournament,” the 33-year-old told reporters.
“That’s something that I’d be encouraging everyone to remember.
“It’s certainly a tough loss to take…but just as we, had we won the game, don’t get too high, we don’t get too low when we lose as well.”
Joe Root top-scored for England with 77, while Buttler (43) and Jonny Bairstow (33) also made starts.
“We were probably looking at a score of 320-330 which would have allowed us to build some kind of pressure,” said Buttler.
“But I thought the margin for error was very small on that wicket and two (New Zealand) batters played exceptional innings.”
England rested Ben Stokes, who is nursing a minor hip injury, and tried Harry Brook, who made a brisk 25 at number four before his soft dismissal.
Buttler said it was not the first time England had suffered a heavy defeat.
“We’re not robots. Sometimes you don’t play as well as you would like. Everyone’s working hard everyone’s prepared well and as I said we were just a bit off,” he said.
“There’s plenty of stuff for us to work on and get better at the start of a long tournament.”
England play Bangladesh in Dharamsala on Tuesday hoping to boost their net run-rate.
(With inputs from Reuters)