Someone who knows you well is keenly aware of what makes you tick and how to push your buttons. This person may be an argumentative individual who enjoys instigating. You prefer a more peaceful, harmonious interaction, Libra, but it does not seem possible with this particular person. However, this may be someone you encounter fairly often, maybe because this is a family member or someone in your group of friends. If you take the bait by reacting, the same thing will keep happening. Next time, ignore it - and take your power back.