People who dm you abruptly and out of the blue, expecting you to hold up a conversation with them, but only because they want to spam you with random character info. It's not even a "hey, how are you? I have a new character I want to talk about", it's literally just a sudden message at 2am in the morning, and it's a full essay. Now, in retrospect, that isn't all that bad, just a bit tiresome when they expect you to reply to all of that and spend hours discussing their character and constantly encourage you to give more and more feedback until they're satisfied. What gets me is when YOU try to give a little lore as well, or even just have a human conversation with them.
Wanna talk about how your day was? Nope! No response. Radio silence until they have the next massive dump of lore. They interrupt any chain of casual conversation with sudden lore as well. Like, I know your characters, but can we talk about you? Can we talk about shared interests, memes, etc.? Are you a real person behind there? Or are you a robot who only goes into my dms when you're bored and want to hear about your characters more?
Better yet, these are the people that go "now give me some of your oc lore/info!" and then never respond to it, or give you a one word response. "Cool!" And then they send paragraphs and get annoyed when you don't spend an hour providing them an in-depth analytic response. It isn't that hard to just give back a little- if you want long responses, give long responses. If you want in-depth feedback, give in-depth feedback. I'm always happy to read other peoples lore and discuss it and am flattered when people feel comfortable enough sending it to me, but these people don't want to have an equal discussion, they simply just want to discuss their character- and that's all they need you for, until they get bored and come back to you again.