Probably no one who knows what happened wants to post about it, in case the mods don't want it to be public. But since Brandon already hinted at what happened... censor away, mods!
My understanding, since I happened to be online that afternoon, is that he was repeatedly calling forum members an offensive name, trolling the chatroom (getting kicked from it over and over and over in the same afternoon), and making spammy forum posts about what was happening in the chat.
I have no personal issue with him either, and I like the info he brings and the research he does. But at the same time, I have to agree with Takumi:
The signal-to-noise ratio of his posts had gone way down in the past few months.