My friend and colleague @Chirag_Mehta added this comment.
I always follow this and it works. I do one more thing: after highlighting the agreements, I explicitly mention the disagreement to confirm my assumption. Many times, it turns out that what I thought was a disagreement wasn't really a disagreement. This also helps the other people to focus on the disagreement and not on the people who have the disagreement. It's a basic element of design - focus on the artifact and the behavior and not on the person.