BM always bringing up the past

My DH FaceTimed the SKs this evening. Their mom was in the background and saw my DH and I’s daughter go down a little slide we have in our living room. She said, “ask SK what happened when DH tried to go down a slide like that when she was that age” and then started laughing.

I feel like she’s always trying to remind my husband of their history with their kids. She finds the most insignificant things to make relevant in a convo, and it happens about every other time we see them during drop-offs or sporting events, or when she manages to insert herself on a phone call like tonight. DH has never acknowledged these comments from her.

Is this something I have to just put up with? It ruins my day every time it happens. Is there anyway to call her out without making things more awkward? I have a feeling she’ll make it seem like we’re being ridiculous.