Disagreements are normal, and for most people so is arguing. Me? I don't fight. To me, fighting is an ineffective and often hurtful communication style. Of course this means I allow my partner(s) to calmly express all thoughts and feelings without taking offense so we can work out the issue. Fortunately, my current partner does the same for me.
I will say it's very taxing to be with someone who is always protecting his or her ego to the point that I don't feel I can trust that person with my issues without backlash. I have had such relationships before; I won't again.