Yeah, Jojo's Bizarre Adventure is probably one of the most clear-cut examples of a split fandom you can find.
To elaborate, Jojo's Bizarre Adventure is a manga series that started in 1987 and is currently ongoing to this day. The series is divided into individual parts, each of them being a largely self-contained narrative with different protagonists and settings that are loosely connected with the others. At the moment, Parts 1-4 of Jojo have received full anime adaptations, and Part 5 is scheduled to release later this year.
The divide in the Jojo fandom is primarily between anime viewers and manga readers. Those who're willing to read the manga have access to all of the series' content that has been produced so far, including monthly releases of the still on-going Part 8. However, those fans who are only interested in the anime only have access to half of said content, meaning that there's about 23 years of Jojo that they aren't able to consume until the later parts are adapted as well. Fortunately, Jojo's Bizarre Adventure has been receiving new anime adaptations in about two year intervals since 2012. Part 4 having come out in 2016 and Part 5 coming in 2018. However, this still means that the anime won't have caught up to the current point in the manga for about a decade though, not to mention that the series will have moved forward even further by then.
This has created a situation where manga readers can't discuss almost half of the series they've enjoyed with anime-only viewers without spoiling them, and where anime-exclusives have to limit their interaction with the wider community or else risk the same thing occurring. This isn't helped by the fact that the age of the series has many older fans toss out spoilers more casually than they would a more recent work. For context, the part the most recent anime adapted concluded it's run in 1995. New content for anime-exclusives is more than a decade old for manga readers.
This has resulted in a community that urges new members to read the manga to the extent that it has become a meme in and of itself. The fandom can get obnoxious about it sometimes, but fortunately the majority more-or-less respect the decision that anime-exclusives have made, and welcome them as new blood.