The original reactions to CalArts slop when it first started infecting modern animation is the most impressive example of 4chan being right I know of. I remember seeing threads complaining about this cookie cutter beanmouth style as far back as 2012 when it was still relatively new.
Fast forward to today and practically all mainstream animation looks like this. All of the people who once understood how to properly stylize human anatomy and make subtle changes to characters' faces to convey an expression are gone. It's only going to get worse. 4chan saw this coming.

https://www.youtube.com/watch?v=HvLHYox_Vq8