This is NOTHING to do with trans issues!!! If you think it is, stop reading now.
In many threads that I post on, I always refer to my children as DC1 and DC2, and use they/them in the singular. This is particularly the case in education areas as DC1 is doing minority subjects in a minority qualification. Their subject combination is unique right now. I know that I am perfectly identifiable by cross-referencing my posts, but I don't need to make it easy to identify the DCs.
I've noticed that multiple posters reply saying DS, and use he/him.
Why is there the presumption that DC/they is masculine?
Genuinely want to know!