In my opinion it's a clear form of abuse. It wouldn't shock me to learn that in the author's life they depeict verbal abuse on people around them. To insult them in a manner that they know will strip them down to nothing, only to build them back up by telling them "you're awesome!" is an obvious form of abuse. It's a cycle - break you down then bring you back and keep you close by "building you back up again."
Humiliating someone is not an appropriate way to inspire. It's the core of what's wrong with our entire thought process on health and fitness. If this person, who clearly just wanted their blog to go viral, really wanted to inspire them - they would have gone up to them, gave them a huge high five and said "you're doing AWESOME!" They wouldn't have written such a tastless letter.
Someone wrote a response as if they were the person who they were speaking about. I felt it was incredible and very honest. Judging someone else's journey is tasteless. It doesn't make for good journalism and it sure as hell doesn't make you a good person.
So, my response to whomever wrote this letter initially - I hope you never have to face the humiliation and suffering that you put this one annoymous person through. I hope you see the error of your ways without having to learn the hard way. But, if the hard way is the only way - so be it.