Sister-in-law speaks with thorns. What should I do with it?

What should I do if my sister-in-law speaks with thorns? How do I deal with a thorn in my sister-in-law's speech? One is to fight poison with poison and go straight back, but this method is not good and easy to hurt people; The second is to respond tactfully and artistically, which is better. The third is to ignore and avoid contradictions.