Note: I wouldn’t ban them permenently, but would consider a cooling off period with an explanation as per why the person was asked not to post for let us say 48 hours.
In addition, I would try to explain why posts are not accepted, at least for long time members. For example, today I posted something that was blocked. I then posted another post asking why I was blocked, giving three options (also blocked). Then another post (I don’t remember the content). Finally I asked the poster who had talked to me to, in a nice way, rephrase their post to omit the offending material. The mods then took down the original post (which I thank them for, it was offensive).
I just wish it was more clear how to reword to make posts more acceptable.