Study: how do you argue with friends vs. family?

I will act like Hitler to my friends only

When I disagree with my friends it is more about a discussion than an argument. I try to use points and back my position using sources or logic. I detail potential outcomes, etc. It becomes more of a pitch, and I try to persuade to my side.

When I argue with my family I try to do the same thing but if they don't understand or don't listen to me it gets ugly sometimes. The situation is much more likely to escalate to a disrespectful area, shouting matches and insults. Also my family and I tend to be more selfish about the desired results of the outcome. For example if we are trying to divide resources, everyone always wants a little more for themselves, and we'll argue over who deserves to get it. When it comes to my friends all of us easily forfeit the extra.