When they make too much food, often they do not have a proper fridge to store the leftovers in. Maybe over the years they got used to not eating leftovers. I know many Dominicans who refuse to eat them - ever!
I thought that also, but more like inconsistent electricity is what makes them think that refrigerated leftovers are unworthy of eating again. But now I think it is because only "poor people" eat leftovers or have to eat them. Remember most of this food is fed to dogs and cats when they dont want it. So they may figure out why would I or should I eat food that I throw to the dogs? "I may be impoverished but I am not poor."
On a side note, I dont think the dogs like it that much anyway as skinny and mangy as they all look.