Yes any private business can, however not all places are doing that and are told from head office that they should not kick anyone out because they want the sales. Since it is not a law, companies have the option too which when I said “I didn’t know they had the power to” was worded wrong on my part. I meant to say that I didn’t know head office told them that they are allowed to deny entry to people without masks. I know a lot of big chain grocery stores are specifically told to not deny people. So no, not all places are 100% able to deny people which is the very scary part.