Yes official divorce does not stop nonsense at all.

The only way to stop nonsense is to stop meeting and talking. When run into each in public, it’s perfectly fine to greet each other politely and quickly move on. Don’t equate civility and politeness with having to talk and meet all the time. You can remain amicable and civil and not engage in any of these endless emailing, texting, calling, arguing and meeting.

He loves to argue. He’ll find the reason to keep doing it after divorce too. It doesn’t really matter when the divorce is final. You aren’t together so that’s good enough reason to cut him off.