I think the term "purist" in most pursuits is so subjective as to defy accurate description.
In photography terms, which "purist" is more pure: The one who uses a modern digital camera to record a scene and make a print with absolutely no post-processing, or the one who uses an archaic, fully manual large-format camera, then spends hours dodging and burning in the darkroom until the print matches his artistic vision of the scene?
I also play guitar as a hobby, and there are many who consider themselves "purists" because they'll only play vintage instruments "straight in" through tube amplifiers....no effects, no solid-state amps, etc. The term "cork-sniffer" is sometimes used to describe their condescending attitude toward modern/solid-state technology. It occurs to me that if they were truly "purists", they would play nothing but gut-stringed vintage acoustic instruments with no amplification whatsoever, as the amplified electric guitar is a modern invention and hardly "purist" in the musical sense. While a teenager of today who plays heavy metal through a solid-state amp and a dizzying collection of effects pedals may consider a '52 Telecaster through an old Fender Deluxe Reverb as "old school" and "purist", an acoustic bluegrass musician would consider it as new-fangled blasphemy that started the ruin of "purist" music. Which one is right? It all depends on where you're coming from.
Going back to the original topic, I guess I don't know where I fall on the spectrum....and don't really concern myself with it. I take photos of things that look good to me. If I think post-processing would somehow enhance the image and make it more aesthetically pleasing, I'll do it; if not, I'll leave it as is. When looking at others' images, I go with my visceral reaction - if something about the image moves me, impresses me, stirs me or whatever, then I consider that a good image. I've seen some HDRs that knocked my socks off, and I've seen (and made!) some that were garish and completely overblown. I've seen some images that have obviously been heavily Photoshopped, yet were very impressive to me - even if what impressed me was the editing/post-processing skill involved. I've seen some "SOOC" images that were absolutely breathtaking, and others that I found blase and mundane.
I've always found that boxing myself in with some artificial, superficial criteria of "purism", "realism", etc. was limiting. I guess in the end I'm pretty simple - I just like to experience things for the enjoyment without getting too wrapped up in labels, genres, categories or whatever. Maybe that's actually the ultimate in "purism"!