Impatient people

Ok so on my way to work this morning I have this car that decided to cut me off so that they could make a right turn. Rather then come in behind me they felt they should pull in front then hit the brakes. They could have just slipped in behind me and did the same thing. But so many people see cyclists as obstacles/inconvenience. They of them don't understand someone might get hurt with their actions. I believe that was the case this morning. The driver seemed surprised that I was next to her window yelling at her. It was like where did you come from? You just cut me off lady at 30+ MPH.