Think about when the 2 of them are discussing about how they always eat what she wants to eat so she agrees to try his favorite foods. She complains the whole time he describes Irish cuisine then is discusted when it is laid before her and she barely tries it. I understand if she is vegan or something, but she was very disrespectful of something he enjoyed.
They were newly married at that point, though. In fact, they had been married just the previous episode. They'd naturally be settling in and getting used to being married, which includes getting to know what your spouse likes and doesn't like.