In reply to iusedtoclimb:
Compare on the one hand discussing matters with your collection of friends, a self-selected group chosen for social compatibility, and, on the other, an all-inclusive internet forum of many diverse and potentially incompatible characteristics. Deny the latter group the all-important access to non-verbal communication and you have a marked contrast in ingredients which goes some way to explaining the different behaviour.
Or is it that some people are just not very nice, yet have learned to master their tendencies better in more formal or personal social environments?
Post edited at 10:20