Training risky, that man was jailed for writing offensive and malicious communications on that internet site. I don't think writing "whatever" is either.
However writing "but she's still an uppity tart" or "has been promoted far above her abilities or usefulness" and "No still annoyed by this TART" could be construed as offensive in the eyes of the law.
So you could be seen as "trolling" as you get a reaction from really annoyed.