A lot of Christians don't like disagreements. It seems that many have the mentality that unless we all think alike, speak alike & act alike we aren't in true unity. In my opinion when people think, speak & act alike they are in a cult! I love disagreements! In fact, I find it hard to think of anything that has been more affective in my spiritual development than a good disagreement. But I don't just consider disagreements personally helpful, I think they are good & necessary for the body of Christ.
Let's take for example the story in Acts 16 of Paul & Barnabas coming into 'sharp dispute.' The tendency among westerners is to select one side and call it 'right' and the left-over and label it 'wrong.' Well I 'disagree' with THAT! If one insists on categorizing they were both right AND wrong. Barnabas was right to give John-Mark a second chance, but wrong to jeopardize the 2nd Journey. Paul was being a good steward of resources, but wrong to not offer the same degree of grace that he had received from God.
But that's not really the point in my opinion. Too often we think of that dispute from Barnabas' or Paul's perspective, but think of it from John-Mark's perspective. Because there was a disagreement he was able to receive a second chance AND know that his previous mistake had been serious. Think about it, if everyone was like Barnabas, John-Mark may have taken obedience to Christ very lightly. If, on the other hand, everyone was like Paul, John-Mark may have become discouraged and left the faith altogether. It took a disagreement for John-Mark to continue going forward on the narrow path.