Ds is 3. I currently insist on no chucking food, no spitting, sitting at the table until we've all finished eating, asking nicely to leave the table, wiping hands and face after eating.
I am currently ignoring the fact that he eats with his fingers even though he can use a fork and spoon perfectly well as we've had awful battles over getting him to eat a range of foods and he is finally eating well every meal time.
When did you go zero tolerance on bad manners?