Wow porca, good for you.
You're absolutely right, it really is too easy to just post the first thing that comes into your head when there isn't an actual person in front of you.
The thing is though, it is an actual person and I think a lot of people lose sight of that.
To be totally honest I don't often look at a poster's name unless the post stands out for a particular reason, be it funny, insightful, rude or exceptionally kind so there are few names that stick in my mind. I'm quite sure there are many posters who I've found hilarious, sweet and a total cock all on the same day but that's human nature.
I think the main danger lies in people who in RL tend to surround themselves with people who either completely agree with them on everything, don't agree but never say anything or just don't ever share their opinions.
I consider myself very lucky that my group of RL friends are a very diverse bunch. We often have massively different views on things both important and trivial and are all more than comfortable with sharing those views. It makes us a lot closer as a group as we all feel free to discuss, disagree, debate sometimes even argue and know without doubt that it does not affect the underlying love we have for each other.
I love hearing someone else's point of view whatever it is. Sometimes it cements my view sometimes it makes me angry but mostly it's somewhere in the middle and I really enjoy seeing things from another perspective.
Yes it can be difficult on forums at times as it's impossible to avoid people that you really really dislike and whose opinions and posting style you find just basically offensive but those people appear in all walks of life. All you can do is either put forward your side of the argument and state why you find what they have said offensive and be prepared for them to reply or just ignore. It's the same choices we face in RL every day.
I also find it very interesting that the people who are the most outspoken are often the ones who take replies more personally. It's definitely the case that the more "highly strung" and emotional people are often the ones who will give a knee-jerk ill thought out response. I find the people most likely to take offence are the ones most likely to cause it.
Wow that was a sermon, I take no offense if anyone got bored and skipped it!
In short, good for you op. Forums like this are a fab way to gain an insight into yourself. Good on you for being self aware enough to take stock.
Hopefully by you being brave enough to start this thread others may do the same.
Great thread op.