It actually makes a lot of sense for Jotaro, though. People just think of him as having some kind of bad ass personality because he's an enormous beefcake, but really he just seems like an introvert shut-in. It makes a lot of sense that someone like him would pursue a career in academia.
Even in Part 4 where he's in his late twenties, he gets immediately flustered when a bunch of strangers show up and can't deal with the situation in a normal way at all. "Josuke, get rid of them." "I hate it when girls make a fuss! Scram!"
And Part 3 is a goldmine for that stuff. At 17 years old, he doesn't really seem to have any good friends and Kakyoin immediately becomes like his bestie. And later, when Rubber Soul impersonates Kakyoin, Jotaro isn't immediately suspicious when his friend starts suplexing pickpockets and eating bugs, but notices right away when he does the cherry trick incorrectly. Jotaro also does one-liners about leaving receipts like he's an accountant played by Arnold Schwarzenegger.
I'd be very surprised if Araki didn't base Jotaro at least partially on a real person who's on the autism spectrum, because a ton of that shit is on point.