I've met him too, but didn't we agree on not having a public blacklist here?
That really is up to Theory, since this is his board. I don't recall him weighing in on this, but I suspect (only suspect, mind you) that he runs this board with a laissez-faire attitude. As long as you're civil in your posts and use the proper spoiler in puzzles, maybe anything goes. I don't know the guy, so please accept my assessment with a grain of salt.
That being said, this is the same kind of talk that you could see in the lobby of Isotropic. People are warning others of bad players. You only have their word that they experienced those negative interactions. Granted, it's more permanent here, but the concept is still the same.
Although, it's worth pointing out (or reminding) that names on Isotropic are not permanent. The bad players you lambast could have easily changed names and made your warning pointless. Even worse, if that problem player used the name of a common term or movie or character, then you may be blacklisting an innocent person. For example, someone mentioned Professor X. He's a great character, so fans tend to use his name. If the jerk who went as Professor X decided to change his name to Magneto, then the next person who decides to take Professor X could be shunned. And let's not forget variants. What is someone goes as Prof X? Technically, the name is different, but we humans just remember that it's the name of the head of the X-Men. That person might get blacklisted too.
Such talk is useful, but we all need to be aware that it's not perfect. In fact, I'd be willing to wager that if a few days have passed, it may be worth giving that name a second chance. Of course, if the same name burns you twice across a length of time, then it may be safe to assume that this name will always be a dick, but it's still only an assumption.
I wonder, though, if someone's name could be snatched up on Isotropic? Is the name reserved for your e-mail address until you request a new one? I'd hate to think that someone could log in as Theory and try to trash his good name (or take advantage of his higher level).