Joining most of the people here in saying, "Huh, what community?" I'm not against trans people, and I despise bigots, but I'm not a part of your community either.
To be honest I don't care to be part of any federated community that defines itself by what it won't tolerate, grow up and use the block feature.
I'm not part of that community either. I'm truly amazed at the number of indignant comments like yours, which demonstrate that you took the post as addressed to you. It obviously wasn't. It was explicitly addressed to posters on 196. I'd recommend being less self-centered, but if you disagree, I'm sure that community would be happy to see you go.
I see it as an effort to establish a mission statement and that they are only interested in conversations that further that mission. I don't see a problem and I also agree with you that there is no community for you there, but I don't see how maturity plays a part.
Part of maturity is accepting that some things are beyond your control, such as the opinions and beliefs of others. You can work to change them, you can ignore them, but simply trying to make them go away is self-delusion. That sort of thing leads to the surprise you so often see on social media where people just can't believe that "backwards" ways of thinking still exist. They're surprised because they shut themselves away in echo chambers, and even while telling themselves that it won't happen, they lose sight of reality.
The internet is at its best when it connects us to the good, the bad and the ugly of the world, broadening our horizons. The internet is at its worst when we close ourselves off into warring tribes. To the title of the thread, transphobia is not actually going to stop now, you can't declare it away, you can just create a fantasy bubble in which you can play pretend.
Edit: tl;dr Are you going to turn your instance into a flyspeck safe space, or part of a broader community, which is going to include some people you despise?
In this context, I would prefer a flyspeck safe space. I don't allow shitheads in my office when I'm planning things. I can meet them in the halls right outside my echo chamber.
I'm really sick of this talking point. If history hasn't demonstrated to you that ignoring a problem doesn't resolve the problem then you take ought to go back and read some more.
If you can't stand to be bothered by others trying to carve out consideration for your fellow humans then I'm glad this may be our only interaction.
Banning a problem from your bubble doesn't resolve the problem either, or hasn't the period from 2016 onward demonstrated that enough for your satisfaction?