Sure, I have a number of people around me who could use the Gospel and they have heard it from me, but they have rejected it all the same (of course, in a nice way to me). And so, after a while, you can only say it so many times when someone tells you it would be better to simply disagree and leave it at that.
There are a whole lot of people like that ... and so, in the end, you’re left with the same person you started with, when you started with the Gospel.
Now, that’s not a reason for not telling them, but it’s just to say that with the larger majority of them, you’re going to have the same person you started with.
There are a few success stories with gays, but for the most part, if you start with a gay person, and tell them the Gospel, you’re going to end up with the same person, afterwards. The real question is what do you do afterwards? Do you disown them and have nothing to do with them? I say no, but you still treat them as a person.
The number of conversions from sodomy to normalcy is actually quite large because it's a choice not a genetic predisposition. With Christ, all things are indeed possible. For those who are recalcitrant in their choice of homosexuality, efforts must be doubled, trebled, quadrupled and so on until they accept God's plan. For those that continue to resist, my opinion is that, yes, one should indeed walk away and have nothing to do with them. If they're that steadfastly wicked in their embrace of that deviant abomination, they are evil companions and must be shunned.