Hmmmm, depends on the person. If it was Max, then I'd run away. Quickly. If someone like Kukul or Cheeze Pavillion, I'd try to avoid an argument but still treat them with some respect and friendliness. If one of the trolls who hang around and somehow avoid being banned, they know who they are, then I'd ignore them. Anyone who I consider a friend on the site, they also know who they are (probably), I'd chat to and generally act as a friend. Anyone else, I wouldn't know, so I'd ignore them too. Unless it was something like Escapism UK, then I'd introduce myself, and follow the 'friend' instructions previously mentioned.
See, I have quite a neat and tidy mind. I must be insane...