Her caution gave the man license to terrorize her?
But I wouldn't call her inability to surveil oncoming traffic, due to her physical condition, as using the best judgement.
In high school in the sixties, I had a mother and her one week old baby make an illegal left turn in front of my oncoming vehicle and a violent crash where (no seatbelts) mother and child were badly injured.
So many people these days see it as their right to multitask behind the wheel and to blatently disregard or forget altogether the rules in the driver's handbook.
That being said, the guy's a jerk.