Keep in mind he has been living with his stepdad since hes 5.
You provoked him by giving him despised answers, just because he said the movie was boring. I don't know your living situation or how your stepdad usually treats you, but since he has been living 12 years with you I could imagine that he sees himself as your father.
Imagine yourself as a father, would you tolerate this behaviour? Everything that happend after that shouldn't have happened in the first place, what you did and what your father did; it just exaggerated.