From the article Facebook Etiquette: Why Quitting Social Media is a Losing Proposition, I got this wonderful quote:
“…Tolerance is difficult, and it is essential that we not glaze over the difficulties with happy platitudes about respecting everyone’s entitlement to an opinion. It is a familiar fact by now that people who loudly advertise their commitment to tolerance should generally be approached with caution. They are generally the nastiest of all when real disagreement arises. This is true for the same reason that veteran soldiers rarely boast about their skills in the way that a green recruit might do. Those who know the business understand that it is too serious for bravado. It takes considerable practice and discernment to learn how to handle grave disagreement without alienating friends or compromising our own integrity.”
Very cool article, well worth reading.