I volunteer at a wild animal care clinic, and have been doing so for almost 10 years. We have a former volunteer who became a paid employee recently. On our online messaging group, she recently changed her name to include they/them pronouns.
I haven't had any issues with her, she hasn't said a word when I've referred to her as "she" or "her." She even genuinely laughed when she was eating from a container that looked just like the ones we store animal food in, and another volunteer and I joked to her that we'd have to label her container like one of our patients' food containers to prevent us from accidentally feeding her lunch to someone else (we put the species, sex, and adult vs. juvenile age bracket of the animal on the container, so it would be NAME: Adult Human Female).
Here's the thing.
We rehabilitate animals. They're not always sexually dimorphic, and it truly does not matter most of the time. We usually guess and just call an animal she or he in conversation because it's easier than calling it by a long (over 7 digits) intake number. I find it so amusing that this "they them" woman just casually determines an animal's pronouns based on observable biological markers, but she's a special soul with an inner identity that differs from her observable biological markers and therefore must be announced to the world.