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.
All of them I can't think of a horror movie that hasn't just been either unintentional comedy or plain shite. Also its always gore and body horror like therr are other drivers for fear.
Games do horror a lot better but its still quite rare to get a truly good horror game.
A lot of horror misses how the mundane is scary. How normality is scary. Focus on some real existential fear based on real things not just some stupid monster or ghost. My favourite horror movie is possum which focuses on horror of having to live in England.
Mouthwashing not to spoil anything is a perfect example of finding your own personalised aspect of horror in a game with many layers to it. It does shoot itself in the foot leaning into some traditional horror game tropes that didn't really need to be there tho
Try The Endless (2017). There's almost no gore (just a few blood splashes, where what it's splashing from is offscreen), and no body horror, but just cosmic "wrongness" and existential dread as you gradually figure out what's happening.