Reelya, tone is not what you say, it's how you say it. If you use more pillow words, you will seem calm. For instance:
"What? How any I stopping people talk about anything? By presenting research articles that don't confirm with your beliefs?" <- This is an attack phrase couched inside a defensive reaction. It is immediately pushing someone toward the defensive. Whenever you say things in this manner it is presenting your argument as if you are already completely in the right, and by extension, anyone you're directing it to is in the wrong. You sound defensive, and you sound hostile, as if I am attacking you, which is why I immediately phrased my next post in such a way that my intentions towards non-hostility were even more clear.
Most of your replies to this thread have been cases of brusk presentation in your words, extremely bare presentation of your opinions, and it reads like someone who is fighting for something. Which is why I posed the question in the first place, because I didn't know whether you were actually trying to be hostile, or unaware of what you sounded like.
This is basically the cause of like, 20% of the disagreements on Bay12. It's entirely possible to convey tone with the way one presents onesself on a forum, and when one is not actively trying to convey a certain tone, one often end up seeming like one's angry.