This fifteen point scale is divided into three sections, color coded for your convenience.
In the Green Band, meriting a score of zero through five, the debate remains "Calm."
In the Orange band, the argument moves to "Heated" status.
Heated debates, with a score of 6 to 10, are generally characterized by insults - either thinly veiled or overt - resulting in ad hominem attacks, unlinked references to rumors or urban legends, and slippery slope arguments which take hypothetical examples to illogical, ridiculous extremes. There may still be valid facts and arguments included, but they are frequently overshadowed by angst and anger.
Finally, in the Red band, earning scores of 11 to 15, we finally move into "Bat Shit Crazy" territory.
I hope this helps. Now, go forth and argue with all of the clueless twits around this wonderful series of tubes we call the Internets and give them a piece of your mind!