People make themselves upset when they rigidly and illogically think:
Because I have a simple request, a fair request, or a good idea my partner absolutely SHOULD do what I am asking them to do.
Try this instead:
Yes I have a simple request which I believe to be the better way to proceed but that does not mean my partner must agree with me. I want them to see the light and do what I want but they do not absolutely have to do so. If they do not do what I think is better I can try to persuade them to see things my way but in the end I may very well fail. Fallible humans do not always come around to my point of view even when I am right. That is why we call them fallible humans. If I want to live well with fallible humans I better watch the silent shoulds, oughts, and musts that I sneak into my thinking. These demands are at the core of my emotional disturbance.