Whether it's an attack or she's trying to draw you in, probably best to let it roll of your back RSG. It sounds like your WW is hearing what she wants to hear, which is the most negative thing she can imagine. My W does this too and it can be frustrating. You're dealing with it the right way though. Just keep ignoring it and address it when necessary.
You are right though. You're an excellent dad and your S is lucky to have you brother! Keep it up!
By the way, making teriyaki salmon with snap peas this evening. Will let you know how it turns out!
Me39 M11 : T13 D9 BD 5/31/16 In House S until 6/21/17 Divorced 10/5/18