Sorry. This has to be done every now and again.
It’s why no one listens to Bible-thumpers.
Leviticus 15:19. Live it or be a hypocrite.
You are quite correct. The prohibitions of homosexuality in the OT are not valid for Christians as such. Any more than we are prohibited from eating shellfish, cutting the corners of our beards, or wearing clothing of mixed fibers. Or that Christian women are required to live in the backyard while having their period.
IMO Christians should not cite passages as applicable today when they are from a Law that no longer applies as such.
However, the NT repeats in multiple places the prohibitions of the OT against homosexuality and other forms of sexual immorality. These prohibitions are, of course, fully binding on Christians.
That said, the peculiar modern conservative animus against homosexuality as uniquely or peculiarly sinful is not supported by the NT, where the practice is usually cited in the middle of a list of immoral practices. IOW, homosexual immorality is not inherently greatly more sinful than heterosexual immorality.
And you are quite right that this hypocrisy is one reason fewer and fewer people are listening to Bible-thumpers.