Another way to think of it is that this is a reason you should be posting in the unbounded category.
You managed to contradict yourself in two short posts that were around one hour apart from each other (I think less than an hour).
You got this mistake pointed out to you, and your response seems to be to say that this is an example that shows you were right about it not being a good idea for you to post in unbounded.
But you are making these kinds of errors whether or not you post in unbounded.
Posting in “friendly” just makes it harder for other people to engage with you and deal with your errors because they have to be more careful about how they point out their errors and what they bring up.
It is OK to point out actual contradictions in people’s arguments in “friendly”. So posting there wouldn’t have stopped this kind of error from being pointed out.
The thing I try to be careful with in “friendly” is stuff like pointing out ongoing patterns of behaviour, which is a more meta issue.
So posting in “friendly” might protect you from certain kinds of criticism. But it actually makes it harder for other people to engage with you at all, since you make these kinds of errors as a pattern, and it is hard to figure out how to deal with that without bringing in unwanted meta.