To put it this way, so are you. You are judging in favor of their lifestyle as though it is healthy and normal - does that mean you are judging them?
Yes we all sin, that is why we are in need of a savior. Just because someone struggles with homosexuality and someone else struggles with alcoholism does not make either preferrable lifestyles.
We do not live in a perfect world and according to the Bible the wages of sin is death. It is appointed unto all men once to die because we are all sinners. Recognizing that I too need God's grace gives me the ability to feel compassion for others and not judge them.
Not judging behaviors as damaging or possibly life threatening is not loving - it is hating to me.
With this said - I will never and have never walked up to someone who I know is a homosexual and started condemning them or their lifestyle. They have neither asked for my opinion nor do they want it. Being involved in a loving way in someones life, recognizing your own sinful nature, and being prepared to support them if they so wish to make a change is loving them.
I have friends who are not Christians, this does not mean they don't know where I stand on things. They know my downfalls and I know theirs. Just because I do not agree with something they do does not mean I do not love them. It also does not mean I preach a way of life to them they are not ready to accept.
What it means is I love them where they are, they know where I stand and I know where they stand. If ever they need help in area they seek to change - I am there, but I love them regardless.