I think that a lot of things can be misinterpreted in online communication, so part of this issue may be due to the fact that you are not speaking face to face.
At the same time, I believe that slight disagreements and 'battle of egos' are a natural part of getting to know each other and getting used to each other. It happens after the initial oh-my-gosh-i'm-so-in-love-stage, when you think you have gotten to know a person to a reasonable extent and you begin to expect them to act a particular way. And when they do or say something that doesn't agree with the picture that you have of them in your head, you are baffled and confused and you try to argue them out of it. Moreover, you assume that by saying X they mean Y to make you feel Z, and of course, it's not neccessarily the case. Our assumptions about how things (and people) are aren't as shared as we think.
The answer is communicating and discovering more about each other through "What did you mean when you said ...?", "I believe things are this way... Is that how you view the world?" and "It upsets me when you do ... because I feel ...". Without assumptions and accusations, to keep things civil
I hope this makes sense
