People take on whole different personas online than they are in real life.
It's easier to convey your ideas bodly online because no one knows who you are, and you don't know them. In a way, expressing your ideas bodly gives them license to do the same. So be prepared for equally bold statements coming back on the other side of the issue. AND you want to be friendly with them. Once they have that impression of you stuck in their head, its a whole lot more difficult to have a meaningful conversation.