How are conductors and non-conductors different? Why are they not charged by rubbing them with our hands?

(N/A) Conductors are materials that allow electricity to pass through them easily because they possess free electrons that can move throughout the material. Examples include metals,human and animal bodies,and the Earth.
Non-conductors (insulators) are materials that do not allow electricity to pass through them. Most non-metals,such as glass,porcelain,plastic,nylon,and wood,offer high resistance to the passage of electricity.
When charge is transferred to a conductor,it readily distributes over the entire surface. In contrast,if charge is placed on an insulator,it remains localized at the point of contact.
When a metal rod is rubbed with our hands,it does not become charged because any charge generated leaks through our body to the Earth,as both the human body and the Earth are conductors.