The "cyber-bullying" thing seemed janky when I read it. We don't know exactly what he wrote to the other parents, or the tone of the conversation they had. We know that one parent was alarmed enough by the conversation to (apparently) forward it to the school administration. It may have been nastier than the author is crediting it for.
This is the same teacher who gave his child a C on an assignment because they didn't put their answers in a separate column. Granted, we only have one side of the conversations, but I wouldn't rule out the chance of the teacher being petty & vindictive.
"We know that one parent was alarmed enough by the conversation to (apparently) forward it to the school administration.'
There is no evidence that the parent who forwarded the e-mail to the teacher (not the school administration; apparently the teacher did that) was "alarmed" by it. They merely disagreed with it. Here's the quote from the article:
"Back in California, when I raised the issue of too much homework on that e‑mail chain, about half the parents were pleased that someone had brought this up, and many had already spoken to the math teacher about it. Others were eager to approach school officials. But at least one parent didn’t agree, and forwarded the whole exchange to the teacher in question."
