So this happened a few years back. Me and a buddy were doing a 3 night backpacking trip that is a 30km loop. We'd packed a bit heavy as it was our first "big" backpacking trip, so we had more than we needed for everything including food.

We had just packed up our final campsite and were about to head out for the hike to the trailhead when we encountered a middle aged lady and her dog on the way going the opposite direction. We exchanged some small talk like where the best sites are and so on, and she mentioned she wanted to extend her hike a bit more, but unfortunately she was almost out of food. 

We just kind of brushed that off as "oh well, that's the rough part of backpacking, never know exactly how much to pack right?" and had we all had a chuckle and went our separate ways.

Once we got back to our car, me and my buddy looked at each other and both realized she was likely hoping we'd offer some of our extra food, and we were so oblivious we never even though to. We felt awful we didn't help her. It's not like she was in danger or anything, she'd just have to hike out sooner that she wanted. 

On the other hand, she should have come more prepared I guess?

Reddit were we assholes for not offering her some of our food? 