With you OP. My eldest has spend the last 2 years identifying as non-binary. We'd just got on top of that, using their preferred pronouns and new name, and now they have told us that they are a transman. Massive amounts of negative energy and tears (from them) because we are transphobic, etc, etc. (Nope, we're not).
It's all me, me, me. No thought as to how it's affecting the rest of the family. They really couldn't see the impact of it all yesterday and criticised the very occasional slip that we make (she/her pronouns and using their birth name - no, actually, I won't refer to it as your dead name. You aren't dead.).
I suggested they have a think about how it would feel for them to suddenly find out I wasn't their mum (I am), but that I was, in fact, their auntie (I'm not) which would cause a huge amount of mental readjustment and a change in how they should address me. They absolutely couldn't see what difference it would make.
I'm of the opinion that it's a control thing - making everyone around them stop and think before speaking. I still don't believe what I'm told by them that anything up to 85% of their year group are LGBTQ+.
Bloody hell, sorry for the rant but I feel just a tiny bit better for that. OP, I second the recommendations above - I found the Bayswater support group very helpful.
All I can say is to keep on buggering on. You aren't a shit parent.