To Irish women, is this idea mainly still confined to the youth or have the older generations adopted it too?
I noticed in my (14 year old) son's SPHE text book the use of the term "assigned" (as of assigned at birth) and it seemed clear to me that what's being written is from an unquestioning/unthinking/uniformed default wokeness. IIRC the book was written (at least in part) by a Home Ec teacher which didn't seem like the obvious choice for good SPHE so who knows where her "expertise" came from (or her information).
The very fact of LGB always appearing as LGBTQ (add in whatever you like) means that being supportive of gay rights has been conflated with support of Trans and Queer ideologies. So there's a level of unconscious slippage into a totally different area.
The young and older women of the Repeal movement - or certainly the louder ones - are unquestioning. And that AFAIK includes Ailbhe Smyth (would be delighted to be corrected on that). But it is hard to get a real sense because these women and loud and aggressive and were well-trained in the Repeal campaign and are all over social media. How many they are I don't know. I'm in my 50s and GC. I have a good friends who are similar (and were involved in Repeal). Most people don't even seem to be aware of the issue - or self-ID. And it isn't surprising. The madness is not discussed, so you largely have well-intentioned unthinking people tacking the "T" onto their support for LGB rights and not giving it any thought at all - and not being prompted to either.
Universities are one of the few areas where "the bathroom issue" hit the media. All the Women's Studies departments are now Gender Studies which always feels like a red flag to me. Writers like Emily Pine who lectures in UCD writes passionately about being a woman but then casually describes herself as "cis". I do wonder how pervasive Trans ideology is in college. I've a son starting this year (who has been instinctively dismissive of the idea of "wrong sex" or changing sex since he first came across the idea) and I'll be interested to learn how he sees it as a student. His feeling to date is that while Trans ideology is nonsense you can't call it out in school without being seen as a bigot (he felt much safer as a primary school child calling out religious faith-based "inconsistencies" or nonsense as he saw it even in a faith-based school than he does trans ideology which says a lot).
The media is certainly unerringly unquestioning and utterly disinterested. Niall Boylan (who I don't know from Adam) is the only media person I've seen actively and overtly call out the nonsense. Fintan O'Toole called out the notion of cis-privilege but went no further. There's no questioning, no thinking, no challenge. Our media is more than a bit rubbish generally but really has shown itself up on this issue.