Justin Bieber is very sensitive about two things: sexy mom jokes, and Justin Timberlake comparisons. On a phone interview with Mojo of Mojo in the Morning, a Detroit radio show, Bieber threw a small tantrum when Mojo told him he thought he was listening to Justin Timberlake the first time he heard "Boyfriend."

Bieber then insulted Mojo's dead mom before abruptly hanging up the phone. You can listen to the interview below, edited for length.

The insult:

And the hang up:

[Mojo in the Morning via ONTD, image via Getty]