though not with my child, who is, of course, universally adored by all...

And I know how maddening it is to reflect later, "Hey, that was a kinda nasty thing to say and not at all how my darling is, really." Cause by then it's way too late. Just festers there, unhelpfully.

Because of where I worked when I lived in St. Louis I was taught conflict resolution strategies for situations like these, so I know what to say and how to say it if I really work at it and come to the conversation prepared. The problem is a) only works if I've prepared for the conversation. If it's "in the moment" I can't deal with it, I have to get some distance. And b)this only works if the other person you're talking to also has some skill at conflict resolution, too, or they get all wigged out. At least in my experience.

If it continues to be an issue, even a low level one, I'd say something about it...but that doesn't mean you have to!
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"If you want your children to be bright, read them fairytales-- if you want them to be brilliant, read them even more fairytales" Albert Einstein