I wasn't suggesting that the FA should ask the passenger to buy the food for the child. I was suggesting that the passenger should put the food on a card and the child would give the passenger the money. This is a different thing, and I am not sure at all how the "airline management" would hear about or why they would find anything wrong with it.
As for the parent giving the child something to eat, I agree. But they may have instead given the child money to buy something. Who would think that an airline would refuse to accept cash?
On the free stuff... I checked their website. It says that they do have free stuff.. this is the list..
On that basis.. I think this complaint is without merit, unless the FA also refused to offer the child any of the free stuff.