> They care is they're told they are so wrong they should kill themselves or be killed. Honor killings are unfortunately still a big deal in some parts of the world.
Nobody is wrong enough to warrant that. I see the "elaborate insult" thing can get out of hand, but, still, it should not be taken at face value. I believe the proper way to deal with this is to either engage in an escalation of extremely elaborate insults (provided you accompany that with technical argument defending your "bad" idea) signalling the insult is not the topic being discussed (but it's "adorning" the arguments) or stating, privately, that the insult crosses a line and asking the person to please not to that again. It usually works.
Disclaimer: I am a caucasian straight married male in his mid-40's. I probably belong to the demographic least susceptible to bullying and some of the situations described here are probably very alien to me. I appreciate constructive feedback, however. I do not know how the moderators would react to an insult war, however, so I advise against it, even if you think it proves your point.