It's just all up to the individua. I hate to name names but I guess I have to. Take Miranda and lizchris for instance.
Miranda rarely posts anymore, but she is genuinely one of the nicest posters I have met since I have been posting. Than you have a poster like lizchris who though maybe in her real life is a great person, comes of as one-sided, defensive and annoying in practically everything she posts.
I mean as far as I know, either of those two could be completely different in what I think I know about them, but based on their posts, I have one perception of them.