And although Bruce stressed he thought referee Lee Mason got the decision spot-on, he suggested Boyd had a better shout when he was pulled down by Fernandinho in the box two minutes later.
Steve Bruce: "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.
"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."