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while the host kept insisting, but it is natural to be a ɧoɱosɛҳųαƖ, they were born that way!  

Tell the host that he and anyone else who believes what he is saying (he likely does not believe it himself, but goes along with it to not go against the tide) has been brainwashed, that for the  2000 years of Catholicism's existence ɧoɱosɛҳųαƖ has never been believed to be something you are born with. The Philippines is a Catholic country.

If someone is arguing ɧoɱosɛҳųαƖs are "born that way" or "it's natural", another response could be: so what?

People saying that are usually thinking that following a "natural" inclination cannot be sinful, and that is simply wrong. Our inclinations are disordered. Part of the problem is these discussions often equivocate around what "natural" means. Does natural mean in accord with natural law, having some genetic basis, or something else? Homo acts are not in accord with the natural moral law.

So, what if it were ever shown that ɧoɱosɛҳųαƖity had some genetic basis? Would that change anything?  If some people are disposed to some sin over another, nevertheless people have the ability and moral responsibility to follow the natural moral law despite inclinations to sinful acts.

For a less political example: kleptomania is an inclination to steal items (it's considered an impulse control disorder). Would a genetically-based predisposition to kleptomania absolve a person from sins in the act of stealing? No, a disposition to an immoral act, even if somewhat difficult to resist, does not take away culpability (though in extreme cases it might reduce culpability). And nobody is asking society to recognize kleptomaniacal behavior as acceptable.