I thought that they were perverts who were actually closeted homosexuals. I thought of it more as a fetish than anything, whereas now I understand it to be far more of a mental illness brought about by escalating porn addiction.
The first tranny I "knew" was online in 2008ish. It was pretty remarkable at the time and I treated it much more as a one-off unique to this gentleman as opposed to a future epidemic of cultural rot. He was a decent guy, but he had a wife and young kids, and I felt absolutely awful for them more than anything when he "realized" about himself. They tried to make it work, but I have no doubt at some point they wanted nothing to do with him. At the time I tried to be nice and respect that he prefered to be called a "she," but it was mostly just super bizarre. I couldn't really take him seriously anymore, and didn't really ask any personal questions about it. The guy was pretty knowledgeable about technology and was nice enough to have around on the site. He never demanded acceptance or even that people respect his pronouns. More than anything I felt bad for him afterward and pitied him. The only reason I was still willing to associate with him in any capacity was because of our prior familiarity, in any event.
I did my best to be libertarian about it at first and disapprove personally but treat it as none of my business in my forced limited interactions with the perverts, same as I tried to do with the gays, but that quickly proved impossible. They showed themselves to be unworthy of pity as my interactions with them and familiarity with them and their condition grew.