Here's how it works:
First, that whole thing about trans people and pronouns: it doesn't apply if the person in question is someone you just don't like anyway. Besides, when you boil it all down, "he" is gender-neutral, so there.
Second, it's possible to support LGBT people while rejecting the most basic premises of trans identity. This is totally possible.
Words like 'cis' and 'transphobia' are divisive, and should not be brought up in conversations about serious topics. But some times it's necessary to distinguish real women from trans women. This is what useful terms like "woman born woman" are for, and it's a shame that people get up in arms about that terminology.
Finally, when disagreements about issues of gender emerge, the dictionary should get the final word. Because dictionaries are about facts! Not fuzzy thinking: FACTS!
To demonstrate how all of this works,
apresvie shows you how to apply these rules on the Internet.
On a more serious note, I feel I should say this publicly: I believe Jack, and am glad that he's getting support. I'm probably not reacting to the situation with the right amount of anger assistance, but it nonetheless remains my hope that Kynn owns her behaviour and gets help.