I always make the assumption others want to engage in a debate. I'm a passionate person, and enjoy hearing/reading what others think. Sometimes I frame this in ways that may offend others, because as said, I'm a passionate person and it's hard for me to guard my emotions. I don't really have this problem when discussing music or movies. In fact, my game discussion style is cribbed from music critique discussions. I guess it carries over as being too abrasive for some.