One of the things I hate is (usually amateur stuff on YouTube) in which the person is getting overly scared even when it makes no sense.
Like they'll over act and start hyperventilating at a leaf and saying shit like "Oh my god what is that?!?!?! WHAT IS THAT?!?!" at like...a thud in the distance.
YouTube and Ghost Hunting shows seem to be the worst offender.
Another trope I hate is a horror game one but it's somewhat related; I hate it when the game tells you when to be scared by having a "sanity" effect or by the player character gasp or scream or whatever. Worst is if they have some kind of heartbeat sound effect that plays when you're supposed to be spooked.
But yeah, if a character starts saying shit like "WhAt ThE FuCk WaS ThAt?!" then I just get more annoyed than scared.
Shakycam. It completely destroys immersion for me, my brain just goes, "HEY DUMBASS THIS IS A MOVIE! IT'S ALL FAKE! You're in a theater with friends or at home on a couch, you're perfectly safe and there's nothing to be afraid of." Really anything that tries too hard to convince me that it's real.
Listen, movie, let me give it to you straight. I'm here to suspend my disbelief and play pretend so that I can get spooked for fun. But here you are being like, "No, suspending disbelief isn't good enough, you need to actually believe," and that is a) not your job, and b) going to trigger a response from my mental immune system and bring out my most critical and skeptical brain functions, which is the exact opposite of the headspace you want me to be in if I'm supposed to enjoy a horror movie. I need to be able to trust the movie enough to let my guard down.