I watched the video. That lady didn’t appear to be waaay overweight. She calmly told her side, not ranting and raving. The doctor, at first glance, reminded me of a younger version of that cretin, Alan Grayson.
I think she was in her right to complain and if a doctor treated me as insensitively as he did her, I’d have been in their face. Low back pain is hard enough; adding an insult on top of it is uncalled for.
It would have been entirely appropriate, IMHO, for her to tear the Dr a new butthole. Preferably loud enough to attract the attention of all his co-workers and clients. I don’t see taking it beyond that, however. Lots of doctors are jerks - ask any nurse...