Do you think there are any fit people who support the ethical treatment of the obese? Because I can't help assume anyone who complains about that stuff is at least two-fifty plus.
i don't see any point in bringing it up with fat folks. it's not like they're unaware of their fatassedness, and any passive-aggressive facile observations ("hey, you'd feel better if you had a salad") or outright scorn aren't gonna change either jack or shit, so unless they come to ME and ask "why the fuck can't i walk fifty meters without wheezing violently, h'derp" i'mma keep my opinion to myself.
i do my role by not bringing shit foods to work or gethering, or providing shit foods in general. on the other hand, i don't take their weight/health into consideration when planning events or get-togethers -- if we do something physical (lol), they exclude themselves; i'm not gonna hold back everyone else's fun because they're unhealthy. that said, i see no reason to shit on them verbally or emotionally. it won't make them healthy. it just makes me more of a sanctimonious asshole, and i already have enough self-righteousness to pass around.
and *if* y'all gave as much of a shit about "society's well-being" as you do about reminding some fat schlub that he/she is fat and that being unhealthy is "bad for us all," we'd live in one FUCK AMAZING WORLD. the fat folks are here, they're fat, and they'll only correct their ways when the incentive isn't delivered by a sanctimonious internet prick carrying around just as much emotional baggage even if it isn't in his/her giant ass.
so yeah, i'm fit, and i support the ethical treatment of the "obese," if by "ethical treatment" you mean "shut my fucking mouth about it because i don't particularly care what their weight is any more than i care about any other personal characteristic that doesn't DIRECTLY impact me in some demonstrable way."
if you shit on fat folks, it's largely because you're an insecure prat, a self-loathing former fatty with an axe to grind, a health cultist, or a general idle internet sociopath, because WHO THE FUCK CARES. if they aren't stealing the donuts straight from your mouth, then let them explore their own unhealthy misery in peace -- and maybe, just maybe, when the hysterical voices die down, they can focus on what they ACTUALLY want out of life, which probably isn't being grossly overweight.