Horror is an all-encompassing genre with sub-genres. It is bastard child in that they've always been shitty to it.
Get Out winning any Oscars was a big ol' middle finger to the establishment in more ways than just it being written by a black man and the content. The Oscars hate awarding horror films (other smaller, more truly artistic award shows are better about this; if you're a movie buff or want to be in the bizz, watch things like the director-guided award shows, movie festival ones, etc.... those are the ones that show which films are actually loved by the people who actually make films).
I digress.
Whereas in drama you have period drama, romantic drama, etc etc and we all naturally recognize this along with comedy having dramedy, action comedy, black comedy (not the racial, but the dark, for anyone unaware of the terminology)... and so on... we often just see horror as horror.
But horror has the supernatural, the psychological, the suspenseful...
Unfortunately, around the time of Saw, Hostel, et al... the blockbuster films fell into the laziness of the gore sub-genre. And about a decade prior to that they'd given over to the laziness of overusing the jump scare*. Which means true, good horror has been really hard to come by. We've had a few. Some of my notables are The Others, Babadook, Paranormal Activity (the first one, but a couple others haven't been bad).
Get Out knocked it out of the fucking gate as an entry back into true horror, but Hollywood is still stuck in the gore because it's easy. It's easy, it's lazy, and people get in the seats for it. The same reason they get in the seats for the lazy comedy films full of toilet humor and second-hand embarrassment. The same reason we've got 8 Fast & Furious films.
*Pro-tip: in a horror film, you always know a jump scare is coming when the music cuts off during a tense scene. If you look at the upper corner (right or left) of the screen, you can still watch out of the corner of your eye while almost completely negating any likelihood of 'jumping.' If, like me, you are a jumpy person, this is a great way to still watch without being startled or having to look away.