I was with someone who I felt was somewhat stuffy and snobbish and disagreed with his view on a certain matter, and I aired my contrary view. As a result, the disagreement got a little heated. Later I saw my mistake this way. Probably most of us have heard the saying "Hate the sin and not the sinner." Applying this in my case, I should have made the distinction between a person's attitude and the person. It's so easy to identify the view expressed by the person with the person. Keeping this in mind, I would have had a civilized discussion or exchange without getting emotional. This tip should also prove useful in any evangelization effort.