I hate fics with no paragraph breaks... i hate fics that don't capitalize the first letter of a name... hate fics that make the characters go ooc to make them "funny" or "sassy" but they just come off as corny, hate fics that put no emotion into the writing, hate fics that don't use proper grammar, hate fics that don't do research on a topic before writing about it, hate fics where the authors constantly leaves Author Notes in random parts of the fic instead of deliberately leaving out information and letting the characters either explain it later on or let the story tell itself.
sorry for my terribly high standards in fics ao3 set it too high and now looking at fics in Wattpad make me convulse.