See my other comments in this thread about the specific emergence of Queer Theory that stemmed from post-postmodern academia. It's a social engineering program to reshape culture in terms of power struggles and blurring of boundaries. They are leveraging the homosexual experience as a power play in this regard, but that is in no sense the same thing as every gay member of society who's not viewing themselves as a special protected class, who's just willing to not shy away or deny it but talk about their experience with whoever cares to listen, agenda free.

I wouldn't be surprised if it were discovered that environmental toxins, vaccines, pesticides, etc. are causing physiological changes that are driving up the number of people who claim to be homosexual.

This is most certainly the case, just like (real) trans the prevalence has become less rare. But don't focus entirely on that, keep in mind that heterosexual populations are undergoing a massive pandemic of infertility in recent years.