I would argue that resorting to physical violence to resolve verbal conflicts is quite high on the scale of intolerable things.
> You should not tolerate intolerance. "If a society is tolerant without limit, its ability to be tolerant is eventually seized or destroyed by the intolerant".
I have issues with this absolutism. What is "intolerance" or not is dependant of culture and context. Such a thin line that can be so easily moved, and you end up with the moral equivalent of "3 felonies a day". Then before you know it, you get fired because someone deemed that using 'they' indiscriminately is a form of intolerance.