First, a question: by your estimate, through what means does any work of narrative fiction, or its creator, show "an incredible ignorance of knowledge of his subject matter and it’s history." You seem to be implying that your grievances with his "knowledge" of "history" lie within the work itself -- for if its evidence did not live in the object itself, what cause would there be to object to it? (Unless you enjoy reacting to publicity interviews rather than the work itself, which stands alone.)
So, how does that "ignorance" manifest itself, specifically, in the movie, and how might it have displayed the "knowledge" you scarcely define, in contrast?
If I were to venture a guess, I'd say it's more likely that you've convinced yourself that the creation of a work of fiction that disagrees with your sensibilities can only be explained by "ignorance" on the part of the creator, and that a greater degree of "knowledge" would have resulted in an agreeable outcome for you. As if the only factor determining the content of an artistic endeavor is a mechanistic output based on a specified input. If there is a math to story, it is hardly so simplistic. It also supposes that, if there is a measurable degree of "knowledge" of a fictional world, and that quality is solely deterministic of creative success within that series -- it is not -- that you have placed yourself in a position of superiority despite there being no objective measure by which to compare the two.
Thought experiment: If you and Rian Johnson sat for a 40-day marathon Star Wars trivia competition, and he won, would you be any less displeased with The Last Jedi? Of course not. Because a creator's level of "knowledge" has nothing to do with the process of decisions that lead to the content of the movie you didn't like.
You didn't like it. That's okay. You don't need to puff up your Star Wars chest to justify not liking it. We're all fans here.
I invite you to choose a frame, or a moment, or a beat, or any other cinematic element from The Last Jedi, and to innumerate your grievances in specific terms. I've seen very little specificity among the dissent, and I'm beginning to believe that the hatred doesn't offer much in the way of granular analysis, but that can't possibly be the case ... can it? The aim, by the way, is not to "win" an "argument", as I don't believe that's what's relevant to the experience of art, but rather to dig deeper into why we've reacted in opposite fashions to the same thing. Which brings us to the way you don't do that ...
Irrelevant to this thread, but the less said about that movie, the better.
If your intent is legitimately to try to understand my view of The Last Jedi or the series as a whole, only questions hammering into the movie in question will offer any insight. You can't triangulate an understanding of someone's taste based on reactions to a few other works. The raw elements that comprise even one of them are incalculably complex. Even the attempt to pinpoint something as subjective as taste or participation in the artistic experience plays into the utter fallacy that there is an objective truth or value that can be summarily agreed upon and measured against. People don't walk into that dark room for the same reasons.
The *craft*, however, is entirely measurable, and if you'd like to point to any specific element of cinematic craft in The Last Jedi you feel doesn't measure up, we can dive in from there.
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No, he'd just rather believe that everyone who disagrees with him agrees with each other. Which, as we know from our myriad tussles through the years, couldn't be further from the truth.