A lot of people go into the genre purely expecting to get scared, and a lot of the time they just leave disappointed, despite that not being the only aspect to horror. This is reflected in the reviews (which average at around 5-7/10 for really great titles, I personally always add +2 to get the actual rating), as well as how rarely they recieve awards (like there are a lot of good acting perfomances that should have gotten awarded, such as Toni Collette's in Hereditary). Also, there are some weird attitudes from non-horror fans such as some people thinking you're sick due to "finding joy in other's suffering" or especially if you enjoy some movies that happen to include some really dark subject matter; regardless of how it's ultimately handled, some people may judge fans for that. Overall I'd say this genre and I believe the comedy genre from what I've seen are treated unfairly due to their highly subjective nature (albeit there are some objective/technical qualities but the average movie goer would be more suaded by the former)