There have always been awful teachers. I have a friend who's a veteran high school English teacher. Some years ago I remember him talking about a woman in his department they were trying to get rid of because she wasn't teaching English, she was teaching flower arrangement. Which is kind of a neat thing to learn, but not her job.
There are individual bad teachers, though, and then there is a collective movement toward bad education. In what at least used to be the normal course of events, teachers might slag off work to pursue their own agenda, but it would just be single teachers doing their own thing. And that thing might just be laziness. The Internet and social media allowed untold thousands in cities across the nation to coordinate their efforts such as they are, and it's given them a flag to sail under.
Much of what the Libs of TikTok account on Twitter did was to show what kind of agenda so many teachers had in common. And if they weren't doing their jobs, what is it they were dong? They were planning together and showing off for each other in a way that would not have been imaginable before Web 2.0. But that meant leaving evidence out in the open where Libs of TikTok could find it. Live by the tech, die by the tech.
Not surprisingly, when the Washington Post took sides on this matter it was on the side of the politicized teachers. But that paper can't settle the argument.