Your usual me writing in paragraphs again whoops haha
1. "Dont interact if you ship these characters/like this character/headcanon this character as (insert gender or sexuality here)" or stuff along those lines. I made a whole rant about that before that I won't go into here but. Man I see a lot of that these days and it really bothers me. It's basically discrimination to tell people not to interact just because they kin a character you hate or like a fandom with a controversial creator (especially that last one, because what if they don't know about the creator's actions? I know I personally dont pay attention to the life of plenty creators. Tbh I probably couldn't even name half of them.) And like.. there's no need to put a giant notice under EVERY SINGLE ONE ONE OF YOUR POSTS saying "don't interact if.." Do you really dislike this thing so much that you have to go through that effort? Let people do what makes them happy in their fandom :( (the only exceptions to this are when it involves pedophilia or homophobia.. because then yeah, better not interact with me either andnkf)
2. CHARACTER GENDER DISCOURSE! this is a huge problem I've seen in a lot of fandoms I'm in and it bothers me so much! If a creator chooses not to assign a character to a specific gender identity, they are leaving it up to the fandom to interpret however they want. Sexuality too! Unless made obvious by the creator, the fandom is free to headcanon anything. I literally see people quick to block others simply because they used a different gender pronoun for a character. Simple headcannons like identifying a character by a gender don't define someone's entire being.
3. Personal one: when the main ship in a fandom (or "fandom otp" as I like to call it) is absolutely everywhere and all other ships get ignored/barley any content. This one's just me I bet because man have I noticed I tend to rarepair (OOF) and the main fandom otp is always one I don't really care for or even a ship I dislike :') like, I understand y'all love your fandom otp but can I please scroll through, for example, some Attack on Titan fanfiction without basically every single one of them being Erin x Levi? I search for a fic on Ao3 and there's 10,000 results but when I filter out the fandom otp it suddenly becomes 20. I know I can't do anything about this.. its just that there is always that one particular ship the fandom chooses to obsess over and all other ships get either very little content or ignored completely.
I have quite a few more but they're and mostly out of personal experience and irrelevant. Fandoms are chaos and the best option is to just enjoy what makes you happy because honestly screw people sometimes :>