If you check the video, the your question should be: when did we get to a point in this country that citizens can harass cops over a tail light? LOL
When government fears its citizens, we have freedom, when citizens fear their government, we have tyranny.
The cop should have asked her nicely for her information, if she didn't provide it, book the license and issue the ticket and go on his way. He escalated it because she wasn't supplicating enough.