The midfielder netted with an overhead kick but the player-manager said: "The second goal, when you watch it back, is dangerous play.
"Kevin Kyle was pulled up in the first half for putting his feet into Ian Black, who is about 2ft 3in.
"He gets pulled up for that but someone can overhead kick the ball in the box at head height. I was disappointed with some decisions."
He added: "We had a game plan and it worked great for 45 minutes but as soon as Rangers got the second it died a bit for us.
"The boys did all right, but I don't like to see them accepting defeat. We should have had a bit more of a go in the second half."