Honestly I'm not a big Lovecraft guy. Like I read synopses of his stories and impressionable nerds being driven mad by wacky weirdo shit seems like extremely my thing, but reading actual stories is like pulling teeth. Maybe he was just that bad of a writer or maybe I don't know English well enough to enjoy his verbose nerdy prose...
As I've said I'm not much of a Lovecraft guy, but people generally point out fear of miscegenation and of racially removed other as his reactionary themes.