Three questions help evaluate speech:
1. Is it true?
2. Does it serve a legitimate good?
3. Can it be said appropriately?
Giving someone accurate guidance about their rights can be better than silence. Joining gossip or accusations is harmful; where appropriate, gently discouraging it is itself beneficial speech.
The repeated خَيْرٌ مِنْ sets out comparisons to show that the preferable choice depends on the moral quality of the companion and the speech.