I don't see a differentiation in the Bible.
If someone were trying to gain government benefits and recognition for their mistress, or market the virtues of adultery to children, we would be equally outraged. Promotion of any immorality is an outrage. That's not to say all sins are equal. Would you rather be lied to, stabbed, or raped? Clearly they are not equal. There are worse things than consensual adult homosexuality; but right now in today's climate, that's a big threat to our social structure and stability. Divorce, adultery, etc. are also threats. The difference is that everyone still thinks those are bad things. Adulterers, when caught, usually have enough sense to be embarrassed and ashamed.
Also, with immoral heterosexual behavior you do not have the added fact that it is biologically unnatural. Embracing homosexuality is embracing an absurdity. To change society in that way is to fundamentally change all relationships.
Keep in mind, you fight the war of the hour. You can talk endlessly about the evils of Hitler and it would be a good thing for you to do. But it won't help you with the evils of Osama bin Laden. You remember past evils so you don't repeat them. But you give most of your time and attention to the threat at hand.
My problem with liberal Christians is that they use the fact that everybody sins as an excuse to claim sin doesn't matter. We should all repent of our sins and turn to God who has graciously provided a solution to our sin problems.
Too many people offer the wrong medicine because they have a wrong diagnosis. Today's probem: No one has the courage to speak the truth about sin. On the rare occasion someone speaks up, he gets shot down, often in the name of godly love. Those who think that's godly love haven't met our holy God. Love of God is love of Truth and righteousness. Love of neighbor is meaningless unless it includes sharing the truth of the gospel, that God sent His Son into the world to save sinners.
Disapproval is a right response to bad behavior. The goal is that the discomfort of disapproval will ultimately lead to a change in behavior. It's the conscience effect. Feeling bad about bad behavior is a deterrent to do bad and a motive to do good. It's a guide. No guilt, no remorse, no change. Ignorance may be bliss but it isn't true happiness, and it ends in the blind leading the blind.