Bangladesh suffered their fourth defeat in the tournament, going down to New Zealand by 75 runs in the ICC World Twenty20 to bow out of the tournament.
"I'm very disappointed with the approach to the score. The wicket was not that easy to bat and we gave away 20 runs extra," the former Sri Lankan opener said at their post-match news conference.
"It would have been a different story but we didn't approach intelligent enough to chase the score down.
On their Independence Day, Bangladesh suffered the ignominy of being folded for their lowest ever T20I score of 70 in 15.4 overs chasing 146.
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On the same day, left-arm pacer Mustafizur Rahim put up yet another inspirational performance with a careerbest haul of 5 for 22.
Showering praise on Mustafizur, Hathurusingha said: "He is one of the intelligent cricketers. For him experience does not matter but it's how you adapt. He's very clever. He has got some variation using them very cleverly and gets on top of the batsmen.
Summing up their campaign, the Sri Lankan said: "Today's game sums up our whole campaign. We were lackadaiscal in fielding, we had some brilliant moments with our bowling. For me it sums up our campaign in the World Twenty20," he said as they made early elimination with four losses from as many matches in the Super 10.