Tom Brady is clapping back at the Andrew Luck haters -- saying, "It's his life. Everyone has the right to choose what they want to do."
Luck was showered in boos from Colts fans on Saturday who were pissed at the 29-year-old for retiring just 2 weeks before the season.
Some ex-NFL players and reporters have also trashed Luck -- essentially saying he's screwing over his teammates, coaches and fans.
But Tom Brady ain't hearing that crap ... essentially defending Luck during his weekly appearance on "The Greg Hill Show" on WEEI.