Go to a supermarket with a large group of people. Twenty should do it, but hey, the more the merrier.
Now shop as you would normally shop, but when you’re done shopping, you unwrap all groceries that have plastic covers, bags, etc and you leave all that plastic for the supermarket to deal with. Friendly: that’s going to be a huge pile of plastic.
Repeat this a couple of times.
Do you think supermarkets will start thinking about offering products with less unneccesary plastic? If it’s causing them problems, extra work and hassle, oh, yes, they will.
The action seems like something Saul Alinsky would come up with, the author of the classic ‘Rules for radicals’