I think there are many different types here, which as was pointed out, is a cross mixture of the world itself.
I think there are those that are aggressive because they can hide behind a computer
There are those that are attention seekers, whether it is positive or negative attention
There are those that feel that they are teaching others, almost still like the JW way of I will preach to you because I am right and you are wrong
There are those that are still of the black and white mentality, my way or the highway
There are those who sit on the fence and those who wish to burn the fence
When I first appeared and posted, there was a poster who I felt was personally very nasty to me. Ballastic was the one that talked me off the ledge, as I was thinking of not returning to the site. He stated that the person I had an issue with was actually very nice, but some times comes across as very abrasive via the message board. This is a false medium. So it is hard to get a good read on people. There is no body language to read. No facial expression to get assist in whether it is a joke or not. For every one person who may be a little abrasive, there are 100 that are gentle. Thank goodness for that, because if that weren't the case, I suppose many of us would never have posted in the first place or returned in the second.