[Buzz]

His answer drew loud laughter from his student audience, reflecting scepticism in China about the wisdom of a developing country accumulating a vast stockpile of foreign reserves instead of spending the money to raise living standards at home

Not the way I read it, sorry. I'm just going by what the quoted statement actually says the laughter reflects, but you are welcome to choose whatever interpretation floats your boat. You could decide they were laughing because his fly was down as well, but that's just not what the article says.