How would you say you disagreed with someone over something in a more positive way? I guess I could say difference of opinion, but is there any other way of saying it that doesn’t have any negitive connotations?
I don’t see how saying “I disagree” has any negative connotation. Obviously, if you intent is to offend or antagonize, then that will come through, regardless of how you state it. But just saying you don’t agree in a respectful manner seems perfectly reasonable.
Disagree without being disagreeable. But, you can say, might we consider the possibility of viewing this from another standpoint? Or, perhaps there is an alternative way to understand this idea.