First things first, this is not an abuse of authority since he
never actually pulled rank or made you do something you didn't want
to. Its more of personal humiliation. Such behaviour is not only
childish but its also unprofessional and reflects badly on the
uniform and rank.
Speak to him and let him know that he is humiliating you. If he
refuse to stop, bring this matter to your PC or OC. The worse you
should do is to lose your temper.