And some people have a far worse starting point for knowledge depending on the preexisting information they were given

Exactly. As the person responded with the link on Wikipedia about existence of third genders, I find that those who are anti-lgbt were just conditioned as such because of either religion, or plain homophobia, or both. I've lived in both religious and non-religious countries, and the former have anti-lgbt sentiment for obvious reasons. Meanwhile, homophobia in the latter-- especially in Europe--are more motivated by sheer disgust on non-heteronormative genders and less about religion. But I still think that the anti-lgbt sentiment by many Europeans is a residue and offshoot from patriarchal and homophobic teachings of Christianity.