Second-half substitute Boyd worked his way into the visitors' box as Hull chased an equaliser to David Silva's first-half effort, before going to ground under a challenge from Joe Hart, prompting a furious reaction from the goalkeeper despite the fact that no penalty was given.
|HULL CITY LATEST
|11/10||Hull City are 11/10 with Betway to bounce back and beat West Brom next weekend|
He told reporters: "There's a difference between simulation and diving, and trying to get out of the road. That's what Boyd is trying to do - nobody's going to stand there with Joe Hart coming at him.
"I think the referee got it spot-on. But the push in the back [by Fernandinho] looked a penalty."
Vincent Kompany's early dismissal looked to have given Hull a perfect opportunity to pull off a shock defeat but the hosts were ultimately unable to break down Manchester City's stubborn defence - much to Bruce's frustration.
He added: "I think the frustration is we have never had a better chance to beat them. In the end, it became one of those frustrating afternoons.
"We know how difficult it is to play against 10 men. We needed the game to go 30 or 40 minutes longer before Silva scored - that gave them something to hang onto.
"It's been a difficult week for Manchester City but I have to say they defended fantastically well.
"We just didn't have the quality to break them down but I have to say City defended very, very well and they scored a wonder goal. Silva's was a fantastic piece of individual skill."