Sometimes people exclusively use "they/their" to refer to trans people who prefer "he" or "she" as a way to try to publicly demean the person's transness. This

Sometimes people exclusively use "they/their" to refer to trans people who prefer "he" or "she" as a way to try to publicly demean the person's transness. This isn't a rare/theoretical occurrence. Most people understand that using "they/their" is a good default when you're talking about a specific person who you happen to not know the gender of. People get that using "they" isn't necessarily an attack, but if you for example do it in response to a message where their gender is made apparent, or if you only do it when talking about trans people, then it quickly starts looking rude.