For passive aggressive behavior, I would do both: 1. Call it out 2. Do not engage depending on the situation.
I’m currently doing NC with my exH (only communicating when we’re scheduling visits), and I’ve found it to be the key of not getting dragged into his mental mess. So I’m curious- how much communication about the kids is really necessary between you two? If passive aggressive behavior is in person, I would call it out - “don’t be an ahole” would do. If it’s thru text/email, I ignore.
Also are you not going thru settlement talks with a L? Letting a L take over all D talk for me was the best decision ever.