Interesting comment and interesting question.
Are you 100 percent responsible for the interaction between you and another person? Can you be? I think yes, you are. You must be. I am 100% responsible for the peace in my home. So is A. He is also 100% responsible. Why? Because I can 100% make a situation bad, worse, untenable. So then why can I not 100% make it better, peaceful, bicker-free? And why can't he?
I don't mean to say that I am the sole arbitir of moods or peace in my house. That's ridiculous. No one is. But I do say the onus lies on my shoulders, as it lies on every one of us, to remember that how we act affects every moment of our lives. And if we don't want to bicker, if we disengage, if we take it upon ourselves to PERSONALLY put an end to the stupid, then absolutely yes, peace is to be had, however momentarily it may last.