[Drolefille]

Well you asked whether some explanations are acceptable. If we say that some are and some aren't then in some ways yes, we're condoning that level of judging.

Particularly considering society's tendency to make the easiest/worst assumption of others: "He's fat because he eats Snickers for breakfast. She cut me off in traffic because she's an asshole."

It shouldn't be "I'm ashamed because my weight came from medication and not eating too much like someone else." People shouldn't feel ashamed for their weight, period.