Honestly I don't get this sort of problem. I mean, why are people sharing pictures with people that say hurtful things? And can't you just toss such people into social isolation away from the spaces you share these things?
The internet is a horrible place, and many people are undeserving of it. But why would anyone share a picture of themselves in a bikini where there are people that'll say "Fat! Kill yourself!"
It's a problem in real life of course, where you can't avoid such people, should they have the lack of empathy and manners to try such things. Honestly taking offense at other people's bodies is just about the dumbest thing you can waste your energies on.