DAISY: It was the car's fault.
BOOLIE: […] You backed the car into the Pollacks' yard.
DAISY: You should have let me keep my LaSalle. It wouldn't have behaved this way.
BOOLIE: Mama, cars don't behave. They are behaved upon. You demolished that Chrysler by yourself.
DAISY: Think what you want. I know the truth.
Daisy's reluctant to give up any of her independence, so she tries to blame her accident on the car, not driver error. We get the feeling that Boolie has been talking down to his mother for a long time, as if he's the parent and she's the child. In this instance, he's right.