Broken Base: Fans are divided on the scene where the CMC are shunned by the whole town once their identities get found out somehow, whether everypony's reaction believable or not, and more so, whether it was justified or hurtful.
Unintentionally Unsympathetic: Word of God is that the residents of Ponyville shunning of CMC was meant to be justified as "them trying to avoid talking to them because anything they say could end up in print out of context." But they admit that nuance wasn't effectively conveyed in the final product, leading it to be viewed as undeservedly cruel. Plus, the fact that they themselves gossiped about someone before just adds in to the trope and makes the CMC embarrassing them seem more like a long overdue penalty.
What an Idiot!: Cheerilee or ANY pony for that matter never bothered to actually figure out what the hell is going on with Gabby Gums and instead just shun the closest people they could find and expect things to be better.
The Woobie: While it is easy to blame the CMC for all the public humiliation they caused, you can't help but feel for the three poor fillies when they're shunned by the entire town, including their own friends and relatives, after word gets out about them being Gabby Gums.