We need to see the build up to this, obviously something happened before the start of this video.
The BMW shouldn't have cut you up to turn off in front of you, but you seemed to be driving far too close after it happened (in a way that would antagonise any driver) any normal driver would have backed off, and allowed the idiot in front to carry on his journey.
She nearly killed me and said it was my fault and that I should go back to my own country (I am originally african). She was extremely racist and a dangerous driver who is a hazard to people around her.