The topic of this thread just strikes me as an unnecessary attack on teenage girls (as if we don't go through enough sh*t as it is). How (certain groups of) women choose to comport themselves and interact with each other is their prerogative, and getting so vehemently angry over the matter is just an embarrassing demonstration of misogyny.
But if it's an answer you're looking for –and not just an attempt to incite a discourse laced with unfounded, irrelevant disdain– I'd attribute this phenomenon of "sugar-coated" comments to the revelation that girls supporting other girls and encouraging self-esteem is a small but significant gesture. Just think how important kindness and solidarity is when our entire gender is up against the patriarchy and billion-dollar industries with the specific objective of perpetuating our insecurity.