I would agree with the author in that christian groups who force their opinions on others are missing the point. As christians our role is to serve as examples to the secular world and to those whose spiritual gift it is to spread the word; they are to do so by showing non-believers the word and the word only.
You're right, to judge in and of itself is not beyond our rights as Christian per se, to condemn is...that only god can do. So for a group to say John is gay, John and Sally have premarital sex, and the wii/PSP can download porn so they are not of god (not saying this article said that) and will burn in hell, is not within the rights given to christians by god. I think that is what the writer was trying to get across.