Listen and relax when faced with a conflict and don't let your self-esteem be rattled. If you do happen to slip into a nonsensical disagreement, let the minor regression only serve to remind you of the giant steps in self-development you have taken. But, don't be smug about it, that would be unattractive.
As a psychiatrist I teach my patients to address passive aggressive behavior directly as the person may not be aware of the impact on you since they are short on empathy. Hopefully you won't have many passive aggressive people in your life, but if you do, clear communication is a form of empowerment.