Indeed, he has been blacklisted from the start and I haven't spoken to him since the blacklist.
He has, however, spoiled multiple animes in /say to other people.
We also had to remove our training dummy because he let his pet spam on it day and night, which makes anyone's nearby visual alerts go off and makes repetitive, annoying sounds. I had to wait for a server reset to remove the dummy because it was stuck in combat.