I think that the people who follow John Birmingham (particularly on his personal blog) are desperate for diets to work. They’re clinging to this dominant narrative about fat people being lazy and eating crap and because they’re trying to “reform” themselves they think that makes them more acceptable. When people like us come in and challenge that notion, it makes them upset and uncomfortable so they lash out with the nasty language and assumptions.
I’m sorry they didn’t respect you, and I think you deserve a gold star for even going in there. I don’t think I will be directly challenging that writer any more because it’s too taxing and makes me feel bad. We’ve gotta care for ourselves, and I really hope it didn’t take too much out of you.