Why do some people eat politely and don't eat anything, while others eat everything, whether it's delicious or not? What happened?

Hello! As you said, these are related to everyone's temper, family and living environment.

Children who live in big families in cities will be educated by their parents from an early age and will also receive higher education after going to school. Such children know books and manners, even if they are grumpy, they are gentle when eating and will not eat everything.

If people who live in the mountains and forests are rough and unconstrained, they don't mind eating because their parents are busy with farm work, they can't get much education since childhood, and they don't receive higher education like city people after school, so they just need to fill their stomachs.