I like a good horror movie, but only when they are unique and creative. These days it seems like every description starts with "A group of friends gather in a remote cabin....". When a new concept comes out, unfortunately, it is followed by a zillion copycats that are just not good or are boring. Also, anybody with a phone can film a movie these days, and for some reason, they all think horror is the easiest genre to make. There are some truly awful "independent" horror movies out there and streaming services are so desperate for content...
The genre defining ones for me are things like Exorcist, Babadook, Nightmare on Elm Street, The Omen. Saw, Hellraiser, The Ring. There are others I'm sure that just don't come to mind. The original Ju-On (Grudge) Japanese movies may be the ones that have scared me the most when watching them. I even have a copy of the short film "4444444444" that started the whole Ju-On saga.