being gay isn't medicalised with potentially irrevocable consequences, so that's one significant difference.
You speak of potentially irrevocable consequences, yet then will concede that the trans regret rate is low, less than 3% and then will also say that puberty blockers are not being handed out like sweets. So which one is it? Either it is a prolonged process with consultation at all points, or suddenly 13 year old boy takes puberty blockers and is on estrogen.
Also, being gay might not have medical consequences, but it can have some rather severe social consequences, especially if one is raised in conservative or religious household. How can you then say that there is a 'trans trend' but gay people should just suck it up if they regret being outed?
the blanket policy of affirming a teen self-identifying as trans is effectively questioning their sexual orientation. because where that person may just be, say, a gender-nonconforming lesbian girl struggling with their identity, they are now taken to be a heterosexual boy with no scrutiny. which isn't what's necessarily best for them in the long run. I'm not saying therapists should be telling anyone 'you're not trans' - that's not how any good therapy works. but just asking them how they feel about it and what's led them to that point isn't conversion therapy. but this is what activists are attempting to ban.
I think you're just substituting your own feelings here. What is to say that a girl is attracted to men and wants to become a trans man to pursue homosexual desire? None of your hypotheticals mean anything apart from your own anxieties on the topic. And as I said upthread, sexual orientation is desire, thereby choice, thereby agency.
It is just assumed that kids are irrational and irresponsible, and are wont to change their mind, as if the same qualities cannot be imputed to adults. If people took this line of thinking wrt child abuse by parents, then nothing would be investigated.