Why does Ruth become angry when Walter gives Travis money for the cab fare?

During
breakfast,asks his mother for fifty
cents and tells her that his teacher requires them to bring
in money
today.understands that her family cannot afford to waste fifty cents and tells
Travis
that he cannot have the money.

Shortly after Ruth
denies Travis the fifty
cents,comes out of the bathroom and agrees to give
Travis the money out of spite. As Ruth stares
daggers at Walter, he proceeds
to give Travis fifty more cents to buy a piece of
fruit.

Ruth is upset at her husband because he purposely undermined her in

front of Travis and gave him money that they could not afford to waste. Walter is a
bitter man
who resents Ruth for not believing in his dream but wants to give
his child the things he never
had. Ruth knows that Travis does not need the
money and would rather save it, which is why she
feels disrespected when
Walter undermines her. She also knows that Walter needs the fifty cents
for
his own cab fare, which is something he ends up realizing after Travis

leaves.