T.I. -- Iggy Azalea Needs to Shut Up ... and Be More Like Tom Brady

T.I.'s grand scheme for Iggy Azalea? Stop tweeting and stick to what she does best ... making music for his record label.

We caught up with Iggy's mentor outside Crustacean in Bev Hills ... and asked how she should handle all of her social media beefs with the likes of Azalea Banks, Snoop Dogg, and now shoe mogul Steve Madden.

The Madden feud heated up this week when she got pissed about modeling pics he released -- and T.I. didn't hesitate to tell us ... Iggy's going about this all wrong.

Watch -- Iggy's boss chews her out in this video, and offers some Deflate-Gate-related advice.

Ding ding ... school's in session.