If I can avoid getting into an argument I will, but if I end up getting involved in one I usually approach it more like a cross-examination; I'll listen to what someone says and see if that checks out with my understanding of the situation. If it doesn't, I'll push that line of questioning further to see if I'm being lied to or not. After an argument I usually block it out and I'll be fine with the person (or people) involved the day after, if not before then. When it's more serious is strange, because the thought of losing a friendship really hurts me, so I'll actively put more effort in to fix things if that's the case.