I think I'd describe that as stupid or annoying more than "nightmarish". Especially if you realize the backstory behind that clip. I'd done some reading on it before, the first time I saw it, it did not feature music. I can't remember what the boy in the video goes by, but it's something like "the butterfly queen" or something like that. He has a fondness for wearing drag, and is friends with Marilyn Manson. The part of the clip I had originally found disturbing was that the boy seems almost mindless, and so his behavior was really quite frightening because it's suggestive of a possible mental state; but when you find the truth behind the backstory you realize he's a somewhat externally deformed human being, and the truth is that he's taking advantage of your prejudices in order to intentionally mess with your head. When you see behind the smoke and mirrors, it's not frightening at all.