Hey there Kulindahr,
I think an even stronger argument that you can build from this is: how does it matter one way or the other? It is my considered and sincere opinion that the bleating about "choice" routinely vomitted up by homophobes is a red herring: a very deliberate attempt to obfuscate and distract from the real issue, which is: how is discrimination on the basis of sexual orientation legitimate?
To clarify: let us theoretically allow those who bleat on about homosexuality being a matter of conscious choice their assumption. The only response any reasonable or considered human being can give is: so what? Is the discrimination and outright spite they evince towards self proclaimed homosexuals any more valid for that? Unless they can rationally and logically determine and express how the "choice" impacts negatively on anyone outside of those who make it, then their position is still ilegitimate, even within the confines of the assumption they feel obliged to assert.
Well-spoken... from the essentially secular worldview of the West.
The trouble is, they're operating in a different worldview: the world of curses and blessings in Deuteronomy. They don't realize that they're not even in the New Testament; they've bought into the premise that Law makes holy, that obedience is the great virtue -- and that imposing obedience by force is not only legitimate but required.
Imposing obedience by force is what led to the Crucifixion: Jesus wasn't obedient to the norms, He praised people in the Old Testament who had violated the Law, He violated the Law as they taught it -- so to end that, they killed Him (though they didn't even have the guts for that; they handed Him over to someone else to do it).
In both cases, this behavior was prophesied, told of beforehand, yet they went through with it: then, they killed the Promised One; today, they kill Him anew by denying what He accomplished. They don't get that Jesus made sin not the issue any longer, so they worry about sin, and inevitably choose not the ones that God said are worst, but the ones that get under their skin and bother them.
They, not the Jews, are the heirs of those who said, "His blood be on us and on our children!", because they are the same line of people who would kill rather than have their comfort zone disturbed.
Anyway... from one point of view you're right: if they can't live in the world that is to a great extent a product of what Jesus taught (mercy, compassion, etc.), then one response is to ignore them. In public, that's not a bad option: just don't respond; tune them out, shun them in the religious sense of the word.
Unfortunately, they can vote -- and so a more fitting response quite often may be to step into their worldview, accept the terms they're actually using -- not the ones they claim to be using -- and do exactly what we saw in that excellent clip from
West Wing.