There are times when one finds it is time to evaluate the situation one is in, pull one's train to a screeching halt and just have a sudden
(oh, for example)
"why am I opening myself up to stress here? Forget benefit/loss analysis, why am I allowing anyone to stress me out here at all?"
(Exception: if they can convince me that I am doing something wrong and that is their aim, then it is worthwhile. If however all that is involved is that there is an interaction for mutual benefit going on, both parties will be -polite- about it at least- no ill language or tone- or I at least will withdraw. INSTANTER and goodbye.)