This is all true, but equally important for young people is that we don't push them towards being trans. Sometimes little boys like pink and Barbie, and they are now being told they must be trans because of it. The result of that means kids get confused about gender and upset that they aren't conforming, when the reality is it does not matter at all if a boy likes pink. When these kids are then pushed towards Mermaids etc they're being stuck on puberty blockers and all other kinds of experimental harmful stuff. The NHS has only recently changed their guidance to say 'puberty blockers are not reversible' which means there are lots of children who have been treated as an unwilling experiment subject, we have no idea what will happen to their bodies later down the line now. So there is definitely a balance between helping people who experience genuine gender dysphoria and treating them appropriately and also making sure we aren't worrying little children unnecessarily about things that are normal and fine such that they end up feeling like they must change gender. You might be interested to search for people who have detransitioned who have interesting stories similar to this, also sometimes they are children who would end up realising they are gay or lesbian later in their lives but their parents have pushed them towards transitioning. I believe the Tavistock recently reported that they have a lot of parents who bring children in saying 'I dont want him to be gay' etc, some of this is just straight up homophobia. It is all very, very complicated.
This is what worries me about the pressure on kids nowadays, using puberty blockers that would then interfere with their bodies health, with irreversible effects, with an echo chamber of TRAs on Twitter making it hard for the individual teenagers to come to their own conclusions and evaluate their own feelings on the process. I understand for those with genuine gender dysphoria how that must be very hard to deal with, but transitioning medically when so young does ring alarm bells for me.
Regarding adults, if a person no longer had the male penis then I would be personally be okay with them in a female changing room with me. If they self Id as female but are biologically male/have male sex organ then no, I am not comfortable with them using female only vulnerable spaces. A lot of us here are not hateful or transphobic, but rather wish for our safe spaces to be safeguarded. I don't hate anyone, but just in the same way as I would feel terrified running alone at night as a petite female I would also feel intimidated in a confined changing room confronted with a naked person with a penis. It's not transphobic in my view, it harks back to the innate biological fear many women have of being typically less physically powerful, to be vulnerable. That doesn't erase the pain trans people must feel trying to be the other gender, of course. But we must all be allowed to discuss freely, rather than being shot down as categorically transphobic just because we want to speak up for our own non-trans concerns.
I am not a rat and I don't live in a sewer.
On sporting, women face so many hardships getting to the competitive levels of professional sport, in contrast to their male counterparts. I can't imagine feeling very good about getting to those heights then being outpaced by a person with broader build, larger muscles and larger stride because they used to be male. It's not a fair match and means the typical female athlete can never compare physically, no matter how talented they are, how hard they strive. Suddenly then women are disadvantaged in a category that was supposed to level the playing field. It's similar to forcing a 5ft teenaged girl to box in a ring with a heavyweight man, it's not on! By all means create a 3rd mixed sex category that any athletes (trans, female, male, non binary) can elect to join and then sub categorize by build/weight whereever appropriate to the particular sport. That would be better.