I recommend no contact (when possible).
Modify your communication because you can’t modify theirs. Be flat. Monotone.
Respond only when they reach out (only when it’s necessary). Grey rocking requires a level of I don’t give a fuck (IDGAF) that is difficult at first.
if it’s not working review your communication and think about your weak spots.
Give short responses with no additional information. Deliver your answers without emotions. Yes even without the anger. (scream in the pillow then reply)
Be Boring. Don’t give them attention that is absolutely necessary.
Example: No prolonged eye contact.
When they try to convert the conversation remain uninterested.
Grey rocking can be really equivalent to no contact. Both are hard in their own ways and both are effective in their own ways.
Grey rocking let’s them know you no longer expect emotional responses from you.
Period.