This and this both seem to me to run aground on the same basic reality: gay people exist, and no amount of quasi-Foucaultian “deconstruction” is going to change that. Even if you could dispense with the concepts of hetero/homosexuality, there would still be people who are exclusively, and more-or-less unalterably, attracted to members of the same sex. And many, if not most, of these people will want to form romantic relationships, which are widely and plausibly regarded as an important part of a good life for most people. Moreover, experience shows us that same-sex relationships can foster many of the same goods and virtues that opposite-sex ones can (and may have unique ones of their own).
These facts are inconvenient for religious conservatives because the options they have traditionally proposed for gay people–feigned heterosexuality or permanent celibacy–are so unappealing. The damage that results from living in the closet is so apparent now that hardly anyone seriously advocates this in public anymore. But celibacy is hardly a better alternative for most people. There’s no particular reason to think that gay people are in general more cut out for celibacy than straight people are. (This is true even if celibacy is pitched as a bohemian alternative to the “bourgeois” nuclear family.) Certainly people can be called to celibacy, perhaps as part of a religious vocation, but it’s unreasonable to demand this of gay people as a class.
I suppose it might be a sign of how much headway gay rights have made that opponents are now resorting to such counterintuitive and esoteric arguments.