You think that transphobia is only when you don't honor preferred pronouns? You keep emphasizing gender like as long as you do that then you're covered and can't possibly be wrong.

Nobody was obsessing over her being trans. Everyone (here) was critiquing or defending her over an entirely different thing. Mostly that people were shitting on dogwalkers and the inevitable struggle session that will bring. You then suddenly bring up that she's trans and keeps dwelling on it and saying it matters. You're the one making an exception based entirely on her being trans. When you pick out that one trait to dwell on specifically and make someone an exception based on it, then you're doing a discrimination.