John Mellencamp hits BACK after shock viral video showed him launch expletive

John Mellencamp has hit back after a viral video showed him storming off stage after he was heckled by fans mid-performance.

The singer, 72, launched an expletive-laden tirade after a concert goer in Toledo, Ohio shouted 'play some music' as Mellencamp attempted to tell a story during a  concert last month.

Mellencamp responded: 'What do you think I've been doing you c