Those are literally forbade by law.Can a business deny a person entry based on color, religion, sex, familial status, national origin, age, and genetic information? No they cannot. There is not the absolute you believe in absolutely...
Instituting a rule that aligns with state mandates, Federal rules, CDC guidelines, and generally accepted practice within the medical community in the thick of a widespread pandemic is so, very, very far away that it makes your argument laughable or sad - I can't say which.
If you think it is discriminatory, then your redress is through the courts. But, you're not exactly the 21st century Rosa Parks because you don't wear a mask.