The very strong implication of the post from Mark when he closed the Rudeboy thread (and presumably also banned Rudeboy - I don't think I've seen him since) is that he got banned purely because of his inability to follow the forum rules regarding swear filter avoidance.
Nope he didn't get banned for swearing.
Check his last posts here and I'm pretty sure that you won't find any swearing or anything in anyway offensive.
http://www.singletrackworld.com/forum/profile/rudeboy
IMO he almost certainly got banned because of my post. As he says in an email to me :
"Funny, because I had a two-day ban, came back, dint post owt offensive, yet now I've been banned for good.
I suspect your very supportive post just served to piss Mark off even more."
I agree. IMO Mark just wants an easy uncomplicated life, and he dealt with the problem by simply banning RB. The swearing whilst maybe a problem in the past (as indeed it has been in my case) was simply the excuse.
It's ironic to think that RB probably got banned because of what I posted.