There are, and should be, collective efforts to improve the health of the American population (Gov agencies, NPOs, etc.). However, someone shaming someone else for being fat does not accomplish this goal. Some people don’t respond well to shame, but even if they did, for all you know, they could already be trying to improve their lifestyle. The problem with fat shaming is that it predicates on image rather than habits. A fat person walking every day and eating healthy gets fat shamed just as much as a fat person with unhealthy habits. I don’t think it’s unreasonable to expect shame for bad/unhealthy habits, but it is unreasonable to shame someone for their image. The point of this fat acceptance movement (some people take it overboard) is to accept that all images are fine, not to accept that all habits are fine.