First, a predefence.
With my mutual respect for others, along with others who are into weight positivity. I speak this as somebody with bigorexia himself. They define it for themselves in regards. With their regards to bodily autonomy which needs to be defended.
The origins of this movement, though, that's what gets me.
Full youtube documentary about the origins. It came from a place of feederists who simply did not want their fetishes critiqued. People who are angry that they can't gatekeep any more.
In regard to my own bodily autonomy, I hope to keep stable. Around 20% body fat (ideally a little below) 170-190 pounds. I doubt I'll reach true body neutrality.
I understand if others can't control it, regarding their own autonomy. It's this information I simply reject the label.