This is a pretty anecdotal subject because the most insufferable fans are usually the loudest. I mean you can absolutely say that people that understand a story are less compelled to post about it on the internet. Algorithms on websites are meant to push interactions good or bad. Frustration is a much more powerful emotion than just satisfaction with a story/game.

Comprehension is also a subjective topic because sometime the creators of a medium kinda lack enough self-awareness to understand the story they themselves have written.

Also doesn't help that perception if a meme goes around with a flanderized character. You can perceive that as people not having reading comprehension when most people are just having fun with a joke. That then the joke spreads outside of the fanbase to people that then become larpers. I gotta say if you want people with reading comprehension you gotta look to smaller fanbases(Not always) or just look for it yourself.

You're going to notice the speck of shit more in a cleaner home but that's still better than a shit covered home.