How is saying "I'm not going to do business with you" beyond the bounds of justice?
Declining to do business with me is not beyond the bounds of justice, but discriminating people based on your own criteria gives the impression that you're acting as judge and jury. Choosing to discriminate and censor voluntarily, without any basis in justice, seems suspicious to me.
If you walked into a restaurant, and they refused to service you because they don't like serving white people, wouldn't you find it suspicious?
Libertarians believe that entrepreneurs have the right to decline a business deal, why do you believe that people should be forced to trade with people they don't like?
Sure, you're free to run whatever software you want. But, if I told you that everyone deserves privacy, and then I refused to provide you with privacy, wouldn't you find it suspicious?