I mean, fair if you are already a millionaire, but otherwise it seems good to at least be aware of how powerful saving $20 a day in the long run can be before making this choice
As with everything, do it within reason. If you can't afford to buy lunch/dinner daily, obviously don't do it. But I think the point that the parent was trying to make was that if you don't feel like cooking one day, it's totally OK to go out for food.
During my holiday this month, I've made it a point to go for a nice lunch every few days. Yes, it costs me money, money that I could save for my future (although I don't know what I would do with the extra money), but it's enjoyable, relaxing and the food is great.
