Are they, though?
I don't see people claiming that "crowded dorms without flush toilets and food sometimes crawling with worms" is totally fine if the plant makes Samsung or off-brand smartphones. What I'm seeing is a luxury brand on the defensive because their customer base learned that the workers making Apple's luxury products not only have been enduring "crowded dorms without flush toilets and food sometimes crawling with worms" but also tainted food that causes mass health issues.
What really boggles the mind is that these sub-human working conditions seem to cause downtime in their plants, which ultimately means it costs them money. But somehow even that is not enough to convince them to treat workers as if they are human beings.