So why is it ok to spread covid just because a face covering worsens your medical condition ? Just because you have asthma it's ok for you to spread covid? If covid is that dangerous asthmatics should not leave the house. This is only political
I agree that the same medical conditions that prevent mask wearing are also good reasons for those people to stay home and isolated.
But the store is probably trying to get most people to wear masks without getting themselves sued. It's like picking low-hanging fruit: lots of gain for little effort. As a business policy, I think it makes sense. As a public health policy, I think it makes more sense than having no-one in masks.