I think a lot of the blame there goes to the skinnyfats. It takes a lot of lazy to have so much muscle atrophy that a fat body can still fall into the "healthy" bmi. But it's pretty much the norm for people outside of the overweight and obese range. And the result is that healthy gets judged in comparison to their very unhealthy lifestyles. Meanwhile anyone who actually exercises just gets labeled as a health nut or athelete. Even when the workouts are pretty mild.