Yes, you are missing the larger context, but I appreciate the question. :) The larger context is that the LBZ admin is an older trans woman herself, and knows how the patterns of transphobia play out in online spaces. She recognizes that, whether or not Person X is “genuine” or “valid” in their gender identity, allowing people to scream “Identity X isn’t real” or similar in response to their mere existence is dangerous in that it makes the site worse and more toxic for every “genuine” or “valid” trans person.

And when ‘dogfucker’ is next, it will be insisted that their gender is valid too, because by refusing to acknowledge any definition of the term, you turn gender itself into an empty mockery.

But does it help trans people to throw insults and yell about it in their spaces, instead of quietly blocking and reporting?

Yes, why do that when you can quietly report and ban anyone who disagrees with the gender of dragonfucker.