Chatting with friends is different, as you are thinking aloud, and can see their reactions as they happen. If you can see that someone looks upset you can pull back, and you are likely to know friends' circumstances, so will avoid topics that are too close to home. We have no idea who is reading threads on here, and there are bound to be times when we read things that make us flinch a bit, and inadvertently write things that do the same to others.
I don't think that asking for sources of information (necessarily) means that anyone feels superior, though. If someone is basing what they say on the fact that little green men are controlling the earth from a spaceship on Hampstead Heath, people really do need to ask why they think that, and if the answer is that there was an article in 'Tall Stories Weekly' about it, also need to question the validity of the source.
I agree that there is no need to be rude, and also that bickering is tedious for others reading it. It can be difficult not to respond when someone is constantly needling you though, and we are all only human.
I guess we all have different tolerances of conflict, too. Some people (a different group from Some People
) hate any hint of disagreement, whilst others revel in a good ding dong then shake hands and go home happy, and there are numerous shades of grey between the two. Also, there are those who hate being disagreed with, and see it as a personal attack when none was intended.
Anyway, I agree with WWM2 that threads about 'Some People' make me feel uneasy. I always wonder if I am one of the ones being picked on, as I do post in N&P, and I do speak my mind, and I don't change it very often. Like WWM says, I'd far rather people said so if that's the case.