This resulted in tons of well-meaning people calling those people idiots.
That resulted in other well-meaning people calling the idiot-callers idiots.
That resulted in me spending two hours figuring out for myself whether the photo is "fake" or not. [SPOILER: Turns out it's fake. (Seriously, it's "fake." Bear with me here...)]
Long story short: it's a panorama made up from multiple images. And the multiple images have all had their cross-hairs edited out to make it more attractive. And the color balances of many of the photos have been altered to make the panorama flow together more smoothly, and thus be more attractive.
1) that the image in question is a panorama stitched from multiple photos
2) that the astronaut taking it was simply standing in one spot and rotating around taking photos.
It explains the inconsistent shadows, as well as having the neat distinction of being assembled by a non-NASA amateur, from photos that are publicly available on the web. If you click through to Apollo 17 on The Apollo Archive you'll find a metric crap-ton of images like the following:
You'll notice that this is the portion of the picture showing the lunar module and astronaut, with cross-hairs intact. If you were so inclined, you could download all those images and run them through whatever panorama software you have lying around and could end up with exactly the same compositions.
So, there you have it. I have absolutely no doubt that the scenario described in the photo happened as NASA claims it did, but I have proven that the photo was very significantly edited in the process.
Turns out that everyone was right. And it's everyone that is the idiot.