What part of their educational goals involve publicly antagonizing their users? The behavior of their PR and their forum moderators does not resemble any open academic environment I've ever seen. It does, however, resemble Tumblr.
And further - you may dislike Liz' handling of things. SO DON'T BE THEIR USER!. Linus Torvalds is about a hundred times worse to his users and fellow developers on public mailing lists. And you know what? He's gotten more and better stuff done thanks to that, compared to any polite project manager I've ever known.
Liz/RPiFoundation (and Linus) may antagonize people here and there - but I suspect that thanks to how they handle things, I think the gain (in users that can afford or find the product useful) to pain (antagonized user/developer) is well above 1,000:1 (perhaps even 100,000:1) which makes it totally justified - in fact, the preferred course of action.
edit: better wording.
I don't see many pictures on the Raspberry Pi Foundations pages - which Tumblr seems to be 99% made out of.