IMO, I don't think masks should be regulated by law. I don't think many things that are, should be. In fact, I believe that unnecessary laws like this are a contributing factor to the increased number of people making careless decisions in response to this virus. The more laws we make over things like this, things that should be left up to common sense, the more the general public is cushioned from decision and consequence, and in turn can be more careless of consequence. Take away a person's right to make their own choices enough, you take away their ability to do so as well.
That being said, I believe regulation of masks should be handled by property owners. If you don't agree with the policies of a certain business, feel free to find another one that aligns with your beliefs. Freedom of choice, one of the things that makes America great.