I'm into sexology so I talk a lot about it in a few places online. One person I talk to is also in contact with professional sexologists (despite not being qualified really, such is his level of interest in certain understudied areas.) Some of the stuff we talk about is very controversial and I'm upset with some of the political agendas that some professional sexologists take on.
Most people I talk to are quite autistic and this is clearly a special interest for some of them. I wouldn't say this is a super uncommon area of interest, but to be into it to the extent I am might be hence why most people I talk to are diagnosed autistic or if not would probably fall into the broad autism phenotype if taking relevant tests. One person I talk to is actually currently studying a completely different subject at university level which must take up a lot of time, and yet is in this one chatroom daily for a considerable amount of time, and on reddit talking about stuff and creating surveys. Most of these are related to one particular topic that he's interested in which I am also interested in, but I'm also interested in most things related to sexology and psychology.
I talk to a bunch of self identified rationalists
so I've started discovering more of that community's content too, but I wouldn't say I'm part of it (or trying to be, cultishness
freaks me out at a point, having said that I don't read lesswrong
atm I've mostly read a few other bloggers) and like... I'm not that intelligent lol. Some of these people are just.. Way above my level.
I'm not really sure how this happened tbh since I basically never talk to people but about a year ago I was researching some stuff and got invited to a chatroom via reddit and then ended up in more chatrooms.
I'm also really into music but that's really common. (listening mostly though I have experimented a tiny bit with music creation/production and briefly self teaching certain instruments, also briefly took cello lessons and went to music school as a kid but learnt very little and these were only breif periods before the age of 10 since anxiety and other stuff got in the way at the time.)
I'm also quite into fantasy and mythology and stuff like that and gender related stuff (which overlaps with sexology.)
I've had many other interests over the years too though (they kind of wax/wane.) I tend to mash up my different stuff so I like reading about sexological stuff in past cultural contexts, and connecting it to mythology, also like reading about androgyny and representations of it in mythology, and I also have read a bunch of stuff about Japanese media and fanworks (a previous special interest of mine was Japanese language + culture,) in connection with sexology or gender. Like this
sort of thing.
And since I tend to be into fandom generally I also read people's takes on sexology topics related to Western fandom as well.
That's why a lot of my posts here are about these topics. I think people mistake enthusiastic interest for knowledge/intelligence sometimes though which is a bit awkward since there's a lot I don't know about all the topics I'm interested in.
I sort of learnt to not talk too much about stuff in real life, because it bugs people after a while when you make everything about your interests. I'm quite self conscious about how obsessed I seem about certain things, even here though I don't bother filtering here too
much. As you can see from the fact that I wrote out this long post that isn't 100% connected to your OP. :P
But yeah, I can guarantee that someone probably is passionate about that topic and about any topic, and that a lot of them will probably be diagnosed autistic lol (autistic people can develop the most obscure interests at times and become completely obsessed with whatever they happen to be into.) But certain stuff is almost always going to be considered boring and interviewers know this but expect you to lie anyway and I really don't like that.