It's like how /r/steak is just dudes posting steak pictures, and there is some new cooking sub where it's just women posting food pictures and complaining about their significant others. Women be complaining.
If you are referring to /r/girldinnerdiaries, that is not a cooking sub, nor is it intended to be. The whole point is pairing a photo of dinner with the situation and mood of the photographer.
It's right there in the name: Girl Dinner Diaries.