SouthPark I didn't condone the way they dissed some students there by calling some of them students 'transfer wrecks'. Derogatory stuff.
I wonder if you read all 19 pages, and weeded through the chaff. I wrote in, followed by a teacher who corroborated. The gist is TRANSFER wreck --- meaning a student transferring from another teacher, where the manner of "teaching" created problems. The new teacher has to fix the problems that were created. For teachers to acknowledge that poor teaching exists is important. When I was in a violin forum at an earlier time, the blame was always on the student. "Follow your teacher." as though all teachers did the right thing. If you were having problems, well you didn't follow your teacher. The term "t.w." disabuses that notion. A student can be in trouble because they followed a teacher - because improper teaching exists.
An example is given after my post of a transfer student with serious weaknesses: within a short time of proper teaching, those weaknesses disappear. Therefore there was nothing wrong with the student: it was what and how she had been taught. That's what the term means.
Unfortunately the teacher who invented the term also destroyed its meaning when asked about it in that thread. I know the actual background. The reality that students can be handicapped by improper teaching is an important notion. That's what the term means.
In a forum meant for teachers advising each other, this is a situation that teachers have to deal with. It also highlights the importance of knowing how to teach before launching into it - so as to not "create wrecks".
What gets dissed are teachers who ruin students - not the students.
The author of negativity in the synthesia thread and elsewhere is not a teacher; at least not in the sense of trained and experienced.