As a child that was your job. Your job now, on the other, is to be an adult. Uncontrolled anger, name-calling, insulting and demeaning comments are not adult behavior. You can be decisive without being threatening, firm without being abusively loud. That's what a child needs to see from an adult.
Adults show frustration, and anger but never hatred toward a child.
You can tell your child what to do, they will be mostly become what you are. To turn around a troubled relationship, be sure, first, that you are modeling the qualities you want your children to be.