Yes, a difficult goal to keep to when the person initiating the discussion starts out with fighting words.
I have zero tolerance for anybody who starts off a discussion with fighting words. Such people tend to last about 60 seconds with me before they run away as fast as they can.
I have never suffered fools gladly, and my old age and possible dotage is making me even more cranky.
I am with @davers on this one. I am content to leave alone those fools who keep themselves to themselves, but if any damned fool tries to ram his stupidities and his idiocies down my throat I give him a good verbal thrashing.