The presence of trans women in women’s sport and the practical impact of that is a valid question.
There is zero info in the story about changing facilities, so no reason to use this story as another thread for discussing changing facilities. Basically the thread is just, "Oh, look, a transwoman."
These people have always existed, and until the recent absurd over-reach of trans activism, there was room for tolerance. We can still preserve that tolerance if law and society cease requiring us to parrot falsehoods or give up our rights to acknowledge and organise around our material sex, and preserve sex-based rights.
Try to think back a decade, to a period before the absurd TRA activism that created the current situation. What would you have thought then of someone who basically just pointed at a transwoman to express mistrust and hostility?