While I agree it's in poor taste to mock people who are just trying to help, there is an important message here, the TLDR is don't send items to disaster zones, if you want to help send cash, if you have no cash try and help in other ways such as spreading awareness, writing to your MP to push for increased government aid or volunteering time to run fundraising events. But don't send "stuff".
We had this when war in Ukraine broke out (when it seemed every man and his dog was hiring a transit van, loading it with random donated stuff and driving to Poland, the poor overwhelmed Polish border towns suddenly becoming a warehouse for all Europe's guilty conscience), and pretty much after every natural or man-made humanitarian crisis ever. It's well meaning but misguided. You will pretty much never see a reputable disaster aid charity like DEC, Red Cross, MSF ask for donations of items or 'stuff' to be sent to disaster zones, and this is a really interesting Article about why that is. Cash is much more useful and can be effectively distributed by a reputable charity towards paying for exactly what is needed on the ground, food, clothing, medical supplies (which can often be purchased locally for less than the cost of shipping the same donated goods from Europe plus this supports the local economy and makes more environmental sense), or perhaps even more importantly, to pay for medical, logistical, civil engineering, construction help to rebuild the community and people's lives, reducing the time period where people are dependent on outside help.
Whoever said about environmentalism and low waste culture perhaps contributing to the trend I think may be right, I'm a member of a few nutty "zero waste" social media groups (people who aim to literally throw away nothing, ever) and while the majority of the advice is sensible and aimed at helping people consume less and reuse what they already have, some people do chime in with nutty suggestions about what to do with obvious rubbish like very well worn underwear or broken kitchenware, which is always along the lines of making it someone else's problem - donate it to a local school or nursery for the children to play or do crafts with is a common one (like any nursery is going to give the children a handleless chipped cheap saucepan to play kitchens with or a headless Barbie for 'crafts'!), or some people do seem to think charity shops are essentially recycling centres for things that have outlived their usefulness to anyone!