It's not body shaming at all, but they are reeeeing because they know that there's no one who makes dresses for their cottage cheese barge bodies.  When you're a blob with extra layers and rolls everywhere, you're going to spill out of and show cleavage/skin no matter what you wear.  So, instead of wearing some dress that they have no business wearing at all (to show muh real woman curves and body), they will be reduced to wearing some "fitted" moo moo that fits the dress code.  So, start pig squeals.