I don't get it...
Because the doctor was indicating that it was her responsibility to lose the weight, it was her fault she is fat, and there is no one to sue about her condition.
I get it.
Obesity is generally a product of poor eating habits and sedentary lifestyle, and caused in many cases by emotional issues. I know that's a broad brush, and there are people who have genetic disposition to heavyness and medical issues, but for the most part we know why most people get fat, the problem is between the person's hands and their mouth.
Then, take that person, who has poor discipline, and throw in the victim mentality: "It's not MY fault I'm fat! My mother blah blah blah blah..."
Throw that person into our culture where people will spend small fortunes on "magic bullet" "cures" to obesity - just take a pill, and you'll be skinny!
That's how you get this woman who's offended. She probably expected to be given a miracle cure to her weight, not told the cold, harsh truth.
Because she didn't really want to know how to fix the problem. She wanted someone to pat her hand and agree with her while she cried about how men are such pigs because they won't talk to her and about how unfair it is that no one makes "cute clothes" in XXXX-circus tent size.
Most of all, she wanted this doctor to nod in agreement when she blamed her weight problem on "bad glands" or "stress", and not on the three boxes of Little Debbie snack cakes and the two gallons of syrup-sweet iced tea she shoves into her maw every single day of her life. But this doctor wouldn't play that game.
Was he a jerk, and was it possible he could have handled this better? Maybe. But that's what your legs are for, to walk out of that guy's office and into the office of a doctor you do like.
But for this woman, that probably would have been too much like exercise.