I think th definition of fat shaming is a little grey as well. For many it's the simple act of mentioning it. The cancer research advert being the biggest one recently where apparently it was fat shaming for cancer research to say it was one of the biggest causes of cancer.
There was another thread where a lady went to th doctors and he told her, in very polite terms her weight which was likely causing some of her complications, and she felt she had been fat shamed by the doctor because he mentioned it.
Another one where in a tapas restaurant the waitress did the norm of explaining you usually ordered three or four small dishes each, and the op decided the waitress was fat shaming her.
Another one where an op didn't want to be weighed during her pregnancy, because that would be fat shaming too apparently.
When it gets to this level, where people can't dont do their jobs, for fear of fat shaming, where organisations such as cancer research can't say obesity is a leading cause of cancer, then for me, the definition of fat shaming has become too stretched.
There needs to be a mid ground between total and utter avoidance of the subject and actually insulting someone because of their weight.