Annoying comments from in laws

Was speaking to my in laws through FaceTime; they live overseas. My MIL asked my husband who did our sons hair (I tie his hair up at the front because I’m growing it out). She snapped “don’t tie his hair up like that”, “stop doing his hair like that” to my husband, unaware that I was in the background. She said whenever we come to visit her she’s going to cut his hair, and we do what we want with his hair, so she will do the same.

I was so annoyed by these comments, I mean she has 4 sons whose hair she changed just how she liked. Now it’s my son and I’ll do what I want. Ugh.