Is that really the most charitable way you could read parents comment? Obviously they're not arguing for that, but rather arguing for "voting with your money", so stop using services where abuse is evident/apparent.
And yes, it's a fairly large list, but it's not unmanageable. Me and my family try to do the same, it's not a huge hassle and it's not like you have to look up every single company before you buy anything, but if something comes up about a specific brand like "Nestle" or whatever, then we change to something else.
Lastly, the list is smaller than you think, I think. Most common consumer stuff you have at home is made by few huge corporations owning all the brands. "The Illusion of Choice in Consumer Brands" (https://www.visualcapitalist.com/illusion-of-choice-consumer...) is a famous view that shows you the situation.