[smichel17]

I think the two are not quite equivalent. Smoking is the action, while obesity is the condition. The equivalent would be shaming smokers for getting cancer or shaming obese people for overeating (to nitpickers: yes, this is a simplification).

The main difference seems to be that smoking in public inflicts secondhand smoke on others, while obesity inflicts... taking up more room on public transit? IF shaming is effective at curbing public smoking, and there is no shaming for smoking in private, then I think you could have a logically consistent position.

I don't know if the first of those is true, and the second definitely isn't (although maybe a different level of intensity), so I'm not saying there is consistency, just that it's possible.