AMathSEUser: if you posted the way Chapman does, at about 150(?) characters per vertical inch, instead of deliberately slowing it down to 5 per inch, then yes, I would have no problem. If you disrupt the meta.MO with these artificial low-density displays then I do have a problem, and suggest it be solved by the deletion of the SPAM you just posted.

AMathSEUser: search for "we are coordinating bans" or "coordinating bans", on site:meta.math.stackexchange.com. As is obvious, what you did is to SPAM a thread and what Robin did is to post high-quality mathematical material. Unfortunately it is the second and not the first that is likely to be banned. The "threshold" question you raised is irrelevant. If and when there there are lower- and lower- density comments on math.SE, feel free to raise that question. For now it is additional spam and I suggest you not try to sabotage the thread if you are not actually a regular user of MO. The SO viewpoint is amply expressed over on the math.SE meta. (edit: "we will coordinate bans" will pull up the new math.SE policy.)

Can you provide a reference for where Jeff actually said that?

Coordinating bans

We will cross-reference with Math Overflow, where possible, to coordinate bans. If a user has been banned from Math Overflow, except in the case of extraordinary extenuating circumstances, they will be banned from here as well.

There you go.

And if what I did was ban-worthy, wouldn't the same apply for Robin Chapman?

I'm not going to bother explaining, since I think you already know the answer, and if you really don't understand, then I don't think I can help you.

If I were to post valuable mathematical content at one word per post, would that be acceptable then?

I'll leave this one as an exercise.

If you wanted to come here to have a discussion, you shouldn't have spammed up the thread. This isn't a "private MO-only room", but you gave up your privelege of discussing this on meta.MO when you decided to act like an obnoxious twit.

AmathSEUser, the difference between your actions and Robin Chapman's is that you're a deliberate troll. Robin was contributing to the site when the one-line comment drama occured.

@T. A much better explanation to why the troll's comments are SPAM: hitting the enter key here actually performs the carriage return. There's no conceivable reason why the posts are formatted that way here except to annoy.