Because policy and laws are being built around it. It seems you're not getting this simple point. As I've said over and over again I couldn't care less about the existence of this incoherent ideology. Any more than, for example, I care about the existence of Christianity. I could spend hours writing about how incoherent and illogical religion in general is. But why bother? People can believe whatever they want to believe.

However, if those beliefs were used to legislate society as a whole, if it became a legal requirement to go to church or a mosque on the Sabbath and worship, if any criticism of religious ideas became forbidden or was treated as bigotry (Salman Rushdie springs to mind), if laws were being written on the basis of these incoherent ideas, then I would speak up. Not as an attack on Christian or Muslim people, but as a defence of a society that runs on rules that make sense.

And it's not just about how it affects my life. Religions are almost universally misogynistic. If a strict interpretation of the Bible or the Quran was used to guide policy (the Taliban spring to mind) the resulting society would be a disaster for women. I'd speak up against this too.

This is a really important point that it seems you're not getting. Some of my dearest friends are Christians and Muslims. I think they're wonderful people. But I think some of the ideas in their religions are ridiculous and harmful (I've read the Bible and the Quran from cover to cover). And I would fight against those ideas being imposed on society in general.

I often wonder if the trans people I speak to are really unaware that children under 18 can get double mastectomies. In fact, children as young as 12 have had them. I wonder if your echo chambers are so well sealed that these facts don't get in. Probably. You just get told over and over again that people who are better informed than you are, "hate" you, right? Here's some light reading that you'll probably ignore. Here's the Mayo clinic saying that HRT typically begins at 16. I'm absolutely aghast at how many trans people I talk to don't know this stuff. A lot has changed since you transitioned. Which is why people are speaking up now who didn't speak up then.

As for people conflating sex and gender, I hate that too. But then you might want to have a word with some of your fellow gender ideologues. They'd savage you for admitting that a woman is an adult human female, even if you believe that definition will change. I've lost track of the number of times I've been speaking to a trans person or an "ally" and had to remind them that sex and gender are different. That it used to be the trans community that pointed this out. Here's a fun case in point.

Again, you try to insist that I have a problem with trans people even after I pointed out that I don't. Isn't it embarrassing that this is the only card you have to play? That disagreement is hate? Say it as often as you want. Repeat it to yourself like mantra. Wish upon a star every night. It's not true. And won't become true. I don't hate you or any trans person. I have no wish to control what you believe. I have no wish to stop you from getting the surgery and hormones you need. I want you to live your life free from discrimination. But some of your ideas are demonstrably harmful when applied to society at large. If you were better informed, you might even agree.