Your exact words were this:
You did not use the word “ban” but you made it very clear that you did not want them posting in your thread. You may have intended it more as an “oh crap, not you again” but it came off more like “don’t post here”.
Regardless of your history with a particular user, as long as they are behaving themselves, they are free to post in any thread, except for those that moderators have banned them from. Even an “oh crap, not you again” post is probably a bit much for an MPSIM thread. Those kind of personal remarks belong in the Pit, not in MPSIMS.
And, as I said in the mod note, if they do misbehave, flag it. We’ll respond accordingly.