Grealish was given the suspension by the Football Association after video evidence was reviewed which appeared to show his boot making contact with Wolves' Conor Coady during a clash between the pair in Saturday's 1-1 draw with Wolves.
Bruce believes the youngster has been unfairly treated, though, and thinks his bad-boy reputation is going before him.
He told BBC WM: "It's something we'll have a conversation about. But I feel he's been a bit hard done by. It's because it's Jack Grealish.
"We have to help him, make sure he sees it was silly what he did, and that he has to cut it out. Unfortunately, we're talking about him in the wrong situation again, when we should be talking about his football.
"He was our best player on Saturday. But he has to realise he has the world watching him as he's got such good talent."
Grealish has already sat out one of the games in the suspension, Tuesday's 2-1 victory at Reading, and he will also be unavailable for Saturday's home match against Fulham and the local derby at Birmingham City on October 30.