It happened to me only with people who were extremely, unreasonably cynical about people's rationality in the first place (including their own). People who couldn't update on the belief of people being unable to update on their beliefs. There's an eerie kind of consistency about these people's beliefs, at least for that much one can give them credit...
You have to engage in some extra signaling of having changed your own mind; just stating it wouldn't be as convincing.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.