I don't see Xeno as derailing threads. There are some here whom he annoys, but you don't have to read his messages if you know beforehand you'll be annoyed. I think I have seen the term "hijacking threads" used, but people should be allowed to change the subject within reason, since it's more of a conversational thing than a formal debate. That is one problem I can recall from the tavern forum, where Kevin or some other guy would sometimes get angry at somebody who would say stupid things out of context, instead of just laughing it off and ignoring him. It's just too hard to do these days, laughing about something rather than fighting about it, letting it drop rather than needing the last word on it.