The stop is justified and she is “required” to abide to lawful orders from the officer at that point (including putting out the cigarette). He was going to give her a warning and she started mouthing off to him. Did he handle it perfectly? Realistically, any of us who mouth off to a cop like that are going to get detained and probably drug down to the jail to cool our jets.
I didn’t say the stop wasn’t justified. The ARREST was not justified. Ordering her to put out her cigarette or antagonizing her with questions about whether she was mad and then faulting her for answering. She did not think she should be ordered out of the car. She may have been scared, give the recent news (wrongly, but still..). He should not have been such a shouting jerk. Later he told the other cop that he tried to calm her down. HE IS LYING. He did not, rather he tried to antagonize her.
If she isn't too young to smoke and there is no immediate hazard (like a puddle of gasoline), it is her car.
He can request it, but demand?