Stop alienating people from engaging with fandom by critiquing their accuracy to the source material, I've had about enough of it. The majority of people doing this are adults, not children, so just sharing my honest thoughts on it since the GW2 fandom is especially bad about it.
People engage with things they like by creating things or posting opinions about it. Sometimes, they like things while also misinterpreting the source material, resulting in inaccuracies in their OCS, fanfics, theories, opinion posts, etc.
The correct answer, in every scenario, is to leave it be and let them be wrong. No corrections, no passive aggressive posts about it, etc. If you simply must, you can offer a private correction and suggestions on how to fit their character better towards the more accurate lore. But there is nothing wrong with interpreting a story or its world inaccurately. Sometimes, people explicitly deviate from source material because they like it more that way as well, it's not always unintentional.
"I'd rather people like something accurately instead of having to read their poorly educated opinions about it online, what's the point of liking something if all you're doing is taking anything you don't like about it and turning it into something you do like?", you might say.
Then enjoy your dying fandom, if you like it that way. People who actually enjoy engaging with the source material, drawing fanart etc., instead of musing about it like some smart-than-thou philosophers will just go elsewhere where they are welcome.
Engaging with the source material involves opening yourself up to the possibility of being wrong about it, and being a nitpick to these people about it sends a clear message: being wrong is not welcome in the fandom.
In GW2's case, it's a video game with a poorly-kept wiki. The only way to know many things about its world and story is to replay the story and listen to all dialogue and take notes. Being wrong about it is practically a fact of life. The game's own writers are held to lower standards than fanartists and writers and I think that's extremely unfair.
All of this elitism is mostly kept passive aggressive on here, tags in reblogs and that sort of thing, so people might read this and think "not me". Nah, still you. It still sucks and alienates people. Stop doing it.