That's not the point though. It's not an issue where someone said something they realize was dumb, which can of course happen.
Sometimes also people say things in a a way that is somewhat unclear in a discussion. It happens to everyone, sometimes just because of the discussion becoming more technical as it goes on.
People need to be allowed to clarify statements like that, to refine them, or just say, ah, I didn't mean it that way, I meant it in this sense. Otherwise it's just a mater of trying to find gotchas, it's not even a real discussion.
I thought it was pretty clear that by "people should be able to live as they like" what was meant was wearing clothes a name, maybe pronouns, and not things like changing rooms or maybe legal gender change - since the poster had said that she thought that already.
At the same time it could easily be taken differently and it can be easy to lose track of what people said in earlier posts.
You can't have a discussion without that kind of give and take and being an ass about it is not "robust". It's just anti-intellectual.