LW is at least showing a shred of self-awareness. I think he can be salvaged.
I would pitch cooking classes as a good thing, not a value judgment on his wife's cooking. "Darling Wife, I want to learn to cook some new things so that I can cook for you sometimes! Since I know nothing about cooking, I'd love if you would take the Weenie Hut Jr Kitchen Basics Class and the Weeknight Staples Class with me. After those I'd love to take [[class on cuisine we both love]] or [[other class on cuisine we both love]]."
And then dude has to follow through on cooking for his wife sometimes. Like, at least a couple of times a week if she likes cooking--more if she doesn't like cooking. Otherwise ... I hope they like pizza?
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I would pitch cooking classes as a good thing, not a value judgment on his wife's cooking. "Darling Wife, I want to learn to cook some new things so that I can cook for you sometimes! Since I know nothing about cooking, I'd love if you would take the Weenie Hut Jr Kitchen Basics Class and the Weeknight Staples Class with me. After those I'd love to take [[class on cuisine we both love]] or [[other class on cuisine we both love]]."
And then dude has to follow through on cooking for his wife sometimes. Like, at least a couple of times a week if she likes cooking--more if she doesn't like cooking. Otherwise ... I hope they like pizza?