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Hating the sin,
while loving the sinner?

I recently had an opportunity to spend a fun evening in a bar with a couple who practice homsexuality. This is not the story of that evening but rather, some pontification on the subject of homosexuality.
I enjoyed the company of these people. While I know that this is not a wrong thing, and in no way did I compromise my message by pretending to support their way of life, some may think me a fool for doing so. Again, that’s neither here nor there.
A few days after my fun evening of trivia and booze, I thought about the recent trend that Christians have in always saying that they “hate the sin, but love the sinner.” I understand the sentiment and agree with it. But how can we hate the sin, making sure that our homosexual friends know we do so, without hating the sinner? After all, many of these people identify themselves as homosexual, just as we label ourselves Christians. If we hate the sin, then that is all they will know about us.
What I want to know is, how can I hate the sin (which I do) when people who live this way almost wholeheartedly identify themselves as homosexual? (I kinda admire them for that you know, we Christians could learn a thing or two about truly identifying ourselves with our label, and living that by it.)
How can I love the sinner, while hating the sin when their entire identity is wrapped up in being a homosexual?