Slip,
There's a diference between judging and taking a stand for what you believe is right. Christians have a saying that goes something like love the sinner hate the sin. With an issue that fires up an emotional response because its so controversial it does make it harder but its something we have to do.

Biblically, homosexuality is no diferent than any other sin. Sin is sin, no matter what it is. We can, and should, love and respect the person, without telling them we think what they are doing is right. If the person claims to be a Christian then we have the resposnibility to help that person overcome that sin, no matter what it is, and encourage them to come to repentence and restoration with God. We can not do that if we sin by being hateful towards the person themselves. However, if the person knows it is sin and refuses to repent then we have no choice but to ask them to leave the church. This process takes a lot of time and must be handled properly and biblically. This applies to all sin, not just homosexuality.