It was a throwaway line barbed with a hook that may yet embed itself in Smith's backside.
You might think a nation that has been playing test cricket since 1930 would have attained a sufficient measure of realness in the ensuing 82 years. You might also think that Smith, who has been fronting up at press conferences for much of the past nine years, coulda, shoulda, woulda known better.
Consider that he said this less than a year after the Black Caps had dumped the Proteas out of the World Cup. Consider, too, that South Africa's results at home at that stage of this summer - drawn T20 and test series and a lost one-day rubber against Australia, and victory by the smallest of margins in a test series against Sri Lanka - hardly gave them reason to swagger.
Of course, it's not bragging if you can do it and the South Africans have done all they can on this tour to exorcise the ghosts of that dark day-night in Dhaka.
That AB de Villiers and Faf du Plessis have been central to South Africa's dominance of the one-day series is nothing short of poetic considering the starring roles they played in their team's World Cup exit.
But after the third, last and irrelevant one-dayer (when will cricket learn from American sport and simply cancel dead rubbers?) there remains on the Proteas' agenda the matter of the test series.
And what better way to give the opposition and their supporters something besides their problems to think about than by insulting them with one short phrase that, once printed out in big, black, block capitals, will fit snugly across a dressing room mirror. Keep it real, fellas.
Telford Vice is a freelance cricket writer in South Africa