Which is unfortunately like what another poster said weaponized incompetence (and all too common in many households truth be told, happens in mine usually with the kitchen trash frustratingly enough). All I did was suggest to the PP that another spot for crushed cans than the sink to free up the space in the sink if the space in the sink is the issue for why they don't prefer the dishes to be placed in there. It would certainly bug me if there was a bunch of cans there.
FWIW my husband's grandmother uses plastic bags in lieu of trash can for her kitchen. One handle is looped around the bar stool from the kitchen peninsula and all the trash goes in there and out into her garage. I'm totally aware of how that works in households, doesn't do any good if people aren't using the bag
I'm not saying people don't help someone out during rough times but even your comment here doesn't make it sound like he grocery shopped for himself, as in that was part of his responsibility, before the issues cropped up.
Neurodivergence is put in there because that may actually prevent the person from being able to know how to do that because of the way their brain intakes that information. My aunt with autism while lives on her own wouldn't be able to grocery shop herself and she's in her 70s. Not that she temporarily (or even prolonged time period) can't but that she never could, never was able to get that skill because of how her brain works. And even then there are autistic individuals who are able to shop for themselves, many likely especially these days with our attention to it.
Personally when I was doing the shopping for myself it made me pay more attention to the nutritional labels and price. Like many I grew up where name brand (to a point for me, my husband had a more extreme degree with his mom). But as I shopped on my own I was comparing the labels and finding store brand could be more nutritional (or in many cases less sodium) than name brand, often half the cost too. And I'm still and was back then a person who wasn't about getting a less tasty meal out of it. We actually prefer Twist and Shout over oreos lol. Anywho he could even pay for delivery and do an online order (which functionally is no different than any other online shopping experience and I'm guessing he has ordered something online at some point). I'm sure one off complaints from him about a missing item don't get to ya but it would suck if you're getting that more and more, you're not ultimately responsible for his groceries even if you're helping him out