The Australian captain, who was fielding at first slip, thought that the England bowler was out, but umpire Aleem Dar had not spotted the ball make contact with Broad's bat.
The former England all-rounder told Sky Sports News: "Have you known any Australian to walk when he nicks it? Michael Clarke and the Australians having a go at Stuart Broad? Seriously Australia, it's sour tactics.
"They didn't worry about Trott on Thursday, they can't have one rule for one and one for another. I've played with Australians who would nick it to second slip and think they could stand there.
"The right decisions are being made, 98, 99% of the time, and that's all you want. As long as technology is used and you say to the players 'we can't guarantee 100% accuracy', they'll be happy with that."
Australia were unable to challenge the decision, having already used up all of their reviews.