So by your rationale, you would be fine with us creating a protected class called the Samurai. This class would not be part of the government, but they would be allowed to cut the head off of anyone who wasn't a Samurai, and disputes between Samurai would be solved through a complex system of etiquette.
If you cannot accept this example, then it would appear your assertions that 'businesses should do what they want' and 'protected classes should exist' are logically inconsistent; in which case what you really want is the ability to use force outside of the realm of making an argument, against those who you disagree with.