No one is talking about whether, “gays were known.” This is about legalizing gay marriage, and the promotion of LGBT. Obviously, gay marriage was not “a thing” in Thailand before.
You are right and wrong.
Where “gay” relationships were known and accepted in the past, whether in Asia in some places or elsewhere, it was not considered a “right”, just accepted, as is, and did not entail “marriage” as a right or otherwise. They were just known relationships that individuals in society chose their own response to, with most either ignoring, or scoffing at, and only close associates openly accepting.
In the west, under socialist/leftist thinking, everything social has to be regulated as a matter of law. Even “Conservatives” have adopted that kind of thinking.
When left to individual thinking and decisions, most social conditions merely are, and accepted or rejected as one’s own family and peers chose, and neither legitimized as a right nor banned under law. Advancing Christian moral conduct under such conditions (which do not exist now) becomes a matter of moral suasion not via power of the state. What the Left has done using the power of the state (”rights”) Conservatives want to now use the power of the state (ban) to undue; while neither rejects the legitimacy of the power of the state to control.
I guess that makes me a “Libertarian” in such matters; though too many Libertarians today deny their own purest principles and acceot the Left’s condifying definitions of “rights”. If they were pure Libertarians they’d just want the state out of the matter all together.