"Some say it is unreasonable to be courteous and gentle with a reckless person who insults you for no reason at all. I have made a pact with my tongue; not to speak when my heart is disturbed. "
There are many things, which have been barely taught over the past 50 years or so, one of these, is the "Custody of the Tongue." Catholics, in particular (especially online) appear to have lost all sense of politeness and the ability to not engage in harmful verbal behaviour.
See the following article for a reasonable overview of how to control your speech:- http://www.spiritualityandpractice.com/practices/features/view/16623/hold-your-tongue.