As other omnivores have noted: one meal is not a sacrifice! Good grief. And frankly it sounds like she's using him as an excuse, because otherwise? Don't tell him there's no meat, and he probably won't notice. Or does she submit every recipe she makes to his scrutiny beforehand? *eyerolling* Does he watch over her shoulder while she cooks? Does he do all the cooking? Because otherwise I'm not really seeing where his opinion was codified into unbreakable law.

In other words... Dear fellow omnivores: shut up unless you're doing the cooking. (And even then, hospitality dictates that your guest has priority; you can eat something you're not crazy about, even if you have to make yourself a turkey sandwich as a midnight snack.)