Unless teachers happen to spend their days sitting around in other teachers' classrooms, I highly doubt that's the case.

Teaching is not collaborative work, and I would not be comfortable giving a peer review to someone who I never interacted with, outside my lunch break.

They do, however, have a pretty good idea of which other teachers they personally don't like.

This feels like an assumption to me.

My wife is a public school teacher. There has always been heavy collaboration between her and her colleagues, even more so now with remote learning. There are certainly unmotivated and lazy teachers and the other teachers know who they are.