And why should a private business not be allowed to be political? Can I not put up a Trump sign at my auto shop? Isn't it their business and their right to do what they want on their property?

If you wanted to kick somebody off your property for wearing a Biden shirt or BLM shirt then you should have that right just as they should have the right with masks imo. We might as well just throw out the idea of private property if the State is allowed to dictate what you can and cannot do.