I don't use social media or texting to share negative things or work out interpersonal conflict. For such things Face-to-Face is best.
When face-to-face, first listen. Understand before opening your mouth. Be a slow cooker, not a microwave.
Henri Nouwen writes:
"When you write a very angry letter to a friend who has hurt you deeply, don't send it! Let the letter sit on your table for a few days and read it over a number of times. Then ask yourself: "Will this letter bring life to me and my friend? Will it bring healing, will it bring a blessing?" You don't have to ignore the fact that you are deeply hurt. You don't have to hide from your friend that you feel offended. But you can respond in a way that makes healing and forgiveness possible and opens the door for new life. Rewrite the letter if you think it does not bring life, and send it with a prayer for your friend." (Bread for the Journey)