AMPM.com review: verbal abusive manager

Hello. I was a employee for Sammy Venture (AMPM) for a little over a year. My manager Susan Subia has been one of the worst bosses I have ever worked for. An old employee left a bucket of gas by my register and I got sick and I got in trouble. She made rules just for me but no one else. She has yelled at me telling me I am a bad person a bad mother when I was asking a coworker what do to about my sons behavior. And in front of customers mind you. She has be littled me many many times. Asked me to quit when I found a second job and I told her for about a week and a half that he was making up my schedule and I would be quitting. Yesterday when I walked in to quit she rips the shirt out of my hand and starts yelling shes a sorry person over and over. My son was with me and walked over to say goodbye (he is 5 he doesnt know any better) and she told him I feel sorry for you, your mother is worthless. I called the owner and he said we deserved it. How does a 5 year old deserve that? Where and what can I do to fix this problem? I want something done but I dont know where to go. Any Ideas?