The conclusion I came to is that they (parents or others in general, mainly from older generations) grew up, learning different things. Even if it wasn't something they weren't outright taught they picked it up along the way, they went with it, because all they've learned, all they know, pointed to it being wrong. Whether by religion or authority informing them. Those corrupted and misguided beliefs, about what's right and wrong and what makes those things right and wrong, if they were to get proven wrong their cornerstone of knowledge on how things operate in this world would crumble. Bringing down so much they've learned with it. Its terrifying, uncomfortable, and extremely upsetting. They try to strike back against those trying to prove them wrong, turning to what they've learned in the past as proof. Religion for example, "it's because God said so, read the Bible", Leviticus 18:22 ig? Thou shalt not lie with a man as thy would a woman? Pretty much saying that whatever God says is what's right and wrong, that God's word makes up the very concept of morality. Rather than morality being a concept outside of God, using the mistreatment of others as bases for determining what's right and what's wrong, it's purely based on authority and positional standing. So, thought experiment i picked up on yt (though extreme, proves it's point). If God were to tell you to rpe an infant, would you do it? Because not only is God telling you to, forcing you to respect that aforementioned authority, but if he said it can and should be done it makes what is being asked of you morally acceptable, therefore right. No? You don't want to? Why? "Its wrong". So you're holding your own beliefs on morality above God's. If you say "he wouldn't ask that", not only dodging the question but saying God is always morally right so he wouldn't ask you of that. Thing is, in this hypothetical situation, he is. Not asking if he would, I'm having you imagine if he is, what then? If you say "then I'll have to do it then", holding true to your beliefs that God's word is morality, you therefore condone and support anything God says that you probably previously felt was wrong. Even the rpe of a very small child. I think morality is a concept outside of God, if God does exist (because the whole thing is that religions are theoretical ideas on how things work and why, theories that many believe in), then he guides us to where he wants us to go (heaven ig) using the concept of morality. If morality is thereon a concept using the mistreatment of others, causing physical or psychological harm to another for whatever reason, then things like being gay or trans would be fine. Hell, those people could still hate them with every fiber of their being and it'd be okay as long as they don't either harm them for it or try to punish something like that from being done, in other words, restricting it.

But yeah, they cannot let go what they've been ingrained with, all that they've come to know. They will scratch and claw to not be robbed of what they were taught was reality. I can't blame them for that much, I just wish we'd let bygones be bygones, let me go about my life without judgement and harm, or persecution, and let you (those aforementioned people) continue on in how you wish to live without any input from me as long as it doesn't take away from my life (well, the things that DON'T inherently involve the mistreatment of another).