I’m pretty sure their underlying reason was a fundamentalist conservative Christian ideology against homosexuality as well as against feminism, which they explained. They accused me of having no morality since I’m not religious, and said that without a religious authority to govern morality, it can’t exist. Like you said, all the other arguments were just distractions to cover up their true motivations for being against things like LGBT rights, women’s rights, and animal rights/veganism. I don’t know how it relates to their vaccine and covid ideas though, that just seemed like conspiracy theory nonsense.