It’s because citrus is acidic, it’s a very common trigger of acid reflux. Same goes for tomatoes, especially in a concentrated form like a sauce.
The issue is that this presents as false equivalence. While that is clearly not what you believe for this situation, the meme reads as a difficult choice between two equally bad options.
Nope, the movie takes place in Utqiagvik (formerly known as Barrow), Alaska, which is one of the northernmost populated areas on earth. From the Wikipedia page:
Edit: to OP’s point, most depictions of the Arctic aren’t that far north. 30 Days of Night happens to be one that really does have that level of continual darkness. Even so, while it’s night for several months, it’s really just the day shortening to the point that you don’t see the sun with that civil twilight reducing to a few hours, and then as the “days” get longer eventually you start to see the sun again. The reverse happens for the summer, where eventually the sun doesn’t set enough to be out of view.