John Mayer, ‘Waiting on the World to Change’ singer was in Perth for his Australian tour, Aussie fans were not pleased reading his tweets referring to Britney Spears.

Mayer subtly rebuked Perth fans who called for a refund of the Britney tickets.

John wrote on his twitter blog “If you’re shocked that Britney was lip-syncing at her concert and want your money back, life may continue to be hard for you.”

Britney, 27, was said to have hid in her hotel room on Saturday (07/11/09) following her performance on Friday night (06/11/09).

A representative for the star said: “Britney is aware of all this and she’s extremely upset by it.”

In response to the show fans protested about the high ticket prices and “impersonal” nature of the show.