Why get upset if someone forms a falsely negative impression of you? When someone interprets a true statement as false, the statement itself is not harmed. It will continue to be whatever it is. And the same is true of you. A person's false belief about you cannot harm your character. Your character remains as it is despite their thoughts. So let them believe whatever they want, for you have no control over their thoughts. Move on. Live your life well and maintain your good character. After all, that is within your control.