I didn’t think anybody is arguing it’s a bad thing to avoid / reduce body shaming. Instead, the argument is that overeating is not predestined and out of people’s control and it’s also not a blameless activity.
By all means go to the beach every day, and fuck anybody that says anything negative. Not everybody has to like the look of your skeleton or your furry suit or the look of you spilling out of your bathing suit though: that’s preference not shame.