I joined here quite late, when I'd already frequented a number of forums for several years, so I was more mature, and well-mannered when I joined. On other forums reading my first post is really embarrasing, my grammar, spelling and logic are all next to incoherent and I was a total cliché.
I have only once managed to procure a warning from a moderator, and I've never been banned, here or otherwise. I have had a few threads locked, for different reasons, but most often for good reasons. Threads being derailed after a while, and similar. Having one's threads locked I'd hardly say constitutes as an offence though. The thread starter isn't responsible for what other people do in their threads, and most often that's what causes it. Some people start arguing in it, or it get's derailed, or loses it's relevance. I did manage to lock one of my own threads and was then unable to unlock it on another forum. That was a bit embarrasing.