Here’s a rude thing: Hanson — of “MMMBop” fame — ineloquently compared Justin Bieber’s music to a sexually transmitted disease during an appearance on an Australian radio program.

On Monday, the band visited Adelaide’s hit107 studio to chat about their Australian tour and play a round of “Whose Song Is It Anyway,” in which guests listen to a music clip and must guess the artist behind the song.

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The conversation turned to Bieber after the Hanson brothers failed to identify “Despacito,” the Luis Fonsi and Daddy Yankee song on which Bieber guests. …

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