It is rude to ignore your mother.
Zach is talking with a friend when his mother comes up and starts asking him something.
Zach wants to choose someone to listen to.
Zach tells his friend to hold on and asks his mother to repeat what she just said.
"Zach gives his mother ""the hand"", telling her to be quiet, and continues to talk to his friend."
Zach's mother gets her point across and feels satisfied that her son listens to her.
Zach's mother gets very upset and starts yelling at Zach about how disrespectful he is.