Exactly, Quietey... what might seem rude or desperate to some may come across entirely differently to others. Esther is British and as a nation we’re pretty friendly and help each other out. A quick “nice to meet you, don’t suppose you’ve got a bit of fruit to power me up this hill lol” wouldn’t be considered “begging” here. Cheeky, maybe, but I very much doubt it would upset anyone or make them suspicious. Perhaps some cultural differences going on here!
I don't think anyone in California (or any of the West's wildernesses and national parks) would get "upset" by being asked for food. It has happened to us many times (and water too - which is even more concerning).
However, most people (including the park rangers) would look upon this as a distress signal and a sign the person might actually be really, really hungry. If said person is on a route continuing further into wilderness, my own response would be to hand them a protein bar but if and only if they promised to turn back. If it were getting dark or weather conditions were volatile, I might just say "turn back, you really need to turn back" and not take the time to dig through my provisions. It also depends on what I actually have. I've offered trail mix and cheese cubes and been turned down - but that's what I keep available in my own pockets. I can understand why people wouldn't want my semi-warm cheese cubes or trail mix that I've been eating from all day. People who ask for water seem to want a full, unopened bottle - not something I carry.
Every single time this has happened to us, if possible we have reported the thirsty/hungry person to a ranger, with description - and been thanked by the rangers for doing so.
However, there are no rangers in many of the places we've hiked and in all my years of hiking, not once did anyone in the more remote places ever ask us for food or water. It was only in more touristed places (mostly Grand Canyon) that this happened. It's happened to us on other trails in Arizona, too.
At Grand Canyon, rangers will walk out to try and find the thirsty/hungry hikers, if they can. I've been asked by rangers if I have extra of food, clothing, emergency blanket on every backpacking trip to GC, because there's someone who is stranded without food or adequate shelter for the night. Most notably, a couple wearing only running shorts and running shorts/sports bra, passed us on the trail at mid-morning, only to be stranded on the lower plateau at dusk - same clothes, completely out of water. There's only one campground, so the ranger came through and asked for donations and brought them back there - where the rangers keep one small tent for such emergencies, but they really needed clothes (we had no extra clothes, but we did have a mylar blanket to contribute).
There are currently 30 people still missing in Yosemite, and something like 7 in Sequoia. Many, many more people go missing and have to be found, nearly all of them were lacking in some basic supplies or equipment.
I would obviously be concerned about such a person (as the French lady clearly was), not upset. I wouldn't "bond" with such a person, but I might offer advice to someone who seemed to be lacking in food while on a hike. I will have to say my views on all of this are formed by a missing persons case I was involved in more than 15 years ago - at Grand Canyon. Person was not alive when found. Insufficient water, long story, but it ended up with new signs being posted at every waterless trailhead on the South Rim...people still go without taking enough water, but they are now clearly warned at the trailhead.