Full offense but you are responsible for curating your fandom experience. You are responsible for making it a fun and safe place for yourself.
Don't like someone? Block.
Don't like a character or ship? Blacklist the tag and stay out of it.
Don't like a trope? Blacklist the tag and stay out of it.
Have boundaries? Enforce them. They're crossed? Block.
Someone asks you to leave them alone? Do it.
People tag triggers and squicks on this site pretty well and if you ask they'll usually tag it for you, so take advantage of it. But just because you're uncomfortable with something doesn't mean no one can make fanwork involving it. (I'm talking about dark topics, not, like, cp or anything else illegal because that is very much not ok)
Don't post hate in the character or ship tags.
Don't insult, harass, or demonize people for liking things you don't. Be mature and move on.
There are, like, actual problems in the world and petty fandom stuff isn't one of them.