Since I made that post
I have seen where cops are trained to ask a subject to extinguish a lighted cigerette. But you are correct, he could have explained why. OTOH, she was in no mood to be part of a rational conversation.
It is probably up to the department. I saw on CNN who I believe is a Texas trooper who said they are not trained to do that.
The elephant here is that blacks routinely say their interactions with police are different. This MAY show that. Blacks may be a bit defensive about police and may show it. Police may be a bit more forceful in dealing with blacks.
A former pastor mentioned in a sermon that he has a black nice and nephew. One is a grad student at Stanford, the other an undergrad at Northwestern. He said they have told him just how different police interactions are even though they are not the inner city demographic. For illustration #2, see Johnny Cochran being pulled while a DA for driving while Black.
I do think she had a bad attitude. I completely understand if the officer would have said "I want to give you a warning but you are making that very hard" (since he said he originally was going to give her a warning). But it seems at some point he went nuclear over her attitude. It is a common reaction. I am sure more than a few umpires desperately wanted to kick dirt at Billy Martin. But training has to prevent that. In this case, based on what is available, it seems the officer broke his training to kick dirt back.
It sort of reminds me of the training civil rights volunteers had in the 60s. Or what Jackie Robinson was told was required of him. It may not be fair, but that has to be what is required of officers, umpires, and referees.