I think people should be able to comment on the transgender issue, providing they do it in a calm and respectful way.
There are people who feel the same as JKR. It is a complex issue and, for me anyway, I find it difficult to know quite what I think about it.
Does the term "transgender" for instance refer to people who are of indeterminate sex - I believe it is known as "inter sex"? Or is it a description of men who currently have, or formerly had, exclusively male genitalia but who now identify as women (and vice versa)? Or does it solely refer to anyone, whatever their physiology, who emotionally and psychologically identifies as female?
I do understand why some people have mixed feelings about this because the experience of someone being born a woman, with a woman's physiology, brings with it a very different experience of the world from that of someone being born a man, with a man's physiology.
In my view, though, JKR's obviously sarcastic, and no doubt hurtful, reference to "Wumben? Wimpund? Woomud? “ was uncalled for and bound to provoke a reaction.
I feel it is OK to debate this issue and express concerns. The level of hatred directed at JKR (or anyone else who expresses misgivings) is, in my opinion, just wrong - and counterproductive.