This thread isn't really about language, it's about power. [Please note the intentional use of a comma splice for emphasis between the two sentences.] Of course, language and power are inseparable, as phrases like "right to speak," "finding one's voice," "getting the last word," and "having a (final) say" suggest.
The thread shows how power struggles were enacted in a particular classroom--an example which perhaps reflects those in other settings--and in a parent's anonymous email. From my perspective, though, the dynamics that developed between posters is even more demonstrative of the relationship between power and language. Analyzing these posts reveal who has power, who wants it, and how people respond to its exertion.
I, for one, applaud how some posters have used humor to defuse the increasingly contentious tone of the thread.