No, it wasn't a "getting up and storming out" kind of thing.
The plates had been cleared, the check presented - we were just guzzling coffee.
And my tone was balanced if trending slightly disapproving. When she snuck it in there I was more by way of being "well then, that's that - on that note..." Not frosty, per se, but a definite cold front had moved into the area. And when there was an audience-appropriate time to reassert the boundary I capitalized on it.
Didn't want to hector her in front of Themselves or a room full of international pancake aficionados.
For what it's worth, STBXMRSSP would be the first to admit she has a self-esteem problem. Nearly from Day One she's repeatedly said things like "I'm unlovable," "I can hardly even get used for sex" (viz, Signore breakup), "no one will ever love me the way you did," "I'll die alone," "All I am is a cheater and a liar and that's all I'll ever be," and the like. She plays it for sympathy, to be sure, but I'm not prepared to dismiss out of hand the notion that this discourse isn't also a fairly accurate portrayal of her own self-evaluations (at least from time-to-time).