Hostel, Turistas: The would outside America is a depraved hellhole full of sadistic criminals
The Green Inferno, The Ruins: Indigenous people are unreasoning bloodthirsty savages
The Wicker Man*, Midsommar: Pagan religions are barbaric cults of human sacrifice (this one has been used to justify imperialist wars as far back as ancient Rome)
Drag Me To Hell: It's about a literal fucking gypsy curse
*The original. The remake is reactionary for its cartoonish misogyny
Yeah. I think he might have continued it in some of his later works he co-wrote like Curse Of Yig, but my memory's hazy on that.