Personally, I think face masks should be personal choice. However, I can completely understand why someone would think differently, or wear one themselves. I don't understand the whole unconstitutional argument, but I'm not American, so I'm not going to bother with commenting on that.
Though, as of the 24th, it'll be mandatory for shoppers here to wear masks when going into a store. I think it's probably too late to be doing that as people are beginning to get back into the swing of things and want to return to normal life. It's also not mandatory for the staff and that has been left down to companies to decide whether or not they want their staff to wear them or not. For example, Lidl has stated that they will leave it up to the individual whereas Sainsbury's are saying that if the customers have to wear one, then the staff should too, which I can understand and actually agree with (on the grounds that it would be both hypocritical and unfair is staff didn't need to).
On top of this, staff members aren't able to prevent or enforce the rules themselves, which in turn makes the law unenforcable on a grand scale, so we'll just have to see how that goes. I'm not personally happy with it, but I'll just deal with it considering the plan is to try and get life back to normal by Christmas, which'll be nice.
Not aiming to change anyone's mind, just wanted to throw in my two cents, really.