Honestly, I believe that one reason why fandoms became so toxic is because there's not enough safeguards to keep bad eggs out. No, not gatekeeping, like "YOU'RE NOT A REAL MOTHERFUCKING FAN UNLESS YOU CAN TELL ME THE ENTIRE BIOGRAPHY OF EACH AND EVERY SINGLE VOICE ACTOR IN YOUR FAVOURITE [INSERT MEDIA HERE]!!!" but more like "You're not a real fan unless you actually interacted with the story through more means than just memes, and can not only behave like a normal ass person, but also won't have a meltdown and act like anyone invovled with your story has tortured your beloved pet to death because they have made the story to go to a way you don't like. No, not even if it's bigoted."
And before anyone wants to twist my words into "You shall not complain about bad stuff, ever!!!!", I merely mean stuff like "This all sucks and I believe the author should be hanged with his own guts" rather than just "I believe that the author has made some mistakes" or "Great... The author has ruined both the story and his reputation by depicting a black character as a dumb, mumbling idiot whose only asperation is to become some gangster, and to top it all off, borderline confirmed in universe that it's because of the character's skin colour rather than any enviromental reason like racism."
Also, yes. I believe that "It doesn't matter how you consume the media" has done some damage too to how fandoms are formed. Obviously, I think if you can't play a game either because of physical limitations (lacking the hardware required to play, it's region locked) or because of the genre like it being a notoriously difficult game, or even a gacha, and you struggle with gambling addiction, that's accepteable. I genuinely meant stuff like JJBA, where the Araki forgot stuff is like "JoSuKe WaS sUpPoSeD tO sAvE hImSeLf" while not only ignoring minor stuff like "Oh yeah, the stranger was a grade below Josuke in the main story" or darker stuff like "It was a blizzard, and the stranger was already injured, so him not being found means he more than likely died"