I see the whole Reitman issue being much more about those wanting to tear down his GB 3 the way others teared down Paul Feig's GB 2016.
I do think that there's a revenge factor from those who felt Feig's film got an unfair shake and now they want to return the favor in kind and take down Reitman's GB 3.
I won't call it a war within the fanbase because the divide seems to be more of the diehard fans of the original films versus those people who supported Feig's film but who may not be diehard GB fans in general.
I'm willing to be that most of the 'fans' of the 2016 film were never truly fans of the original, they were fans of the idea of an all female Ghostbusters film. There's a group of people who are not really interested in these type of intellectual properties as they are or were, they're interested in having them be changed to what they like. So, these folks weren't really Ghostbusters fans, but they liked the idea of Ghostbusters being changed for them. And Sony went along with it only to find it's not what most people wanted, and now they're pissed because they see it as a step backwards. We saw something similar happen to Star Wars after TLJ debacle, and even in Star Trek. Companies are starting to realise that the old fans, fans of the how the properties originally were and what they stood for, are the lifeblood of these franchises, and that these mythical 'new' fans don't exist.


