WOW!
This whole scene can be "Picked Apart" both pro and con.
The officer was "Stressed" before the stop.
In my career shifts have gone from 8 hours, to 9 hours, to 10 hours, and now to 12 hours. I believe that 12 hour shifts are too long for patrol. I am thinking that this scene was at the end of these officers 12 hour shift.
Of course there is no excuse for the officer's conduct.
I can see "Law Suit" coming.