Not quite sure what this persons issue with and why they feel their time is more important driving dangerously is an OK thing to do just to be sat in queuing traffic.
When sat in traffic they decided to just come from behind me and push right in as traffic started moving again, had to slam on the brakes as they cut in so narrowly.
Could you kindly not drive 30 - 40mph *below* the speed limit? There is a mile of traffic behind you who would like to get home sometime this century.