About a month ago Massimo Pigliucci announced his "resignation" from the skeptic and atheist movement (SAM). His parting remarks were cutting and brutally honest.
[SAM is ] a community who worships celebrities who are often intellectual dilettantes, or at the very least have a tendency to talk about things of which they manifestly know very little; an ugly undertone of in-your-face confrontation and I’m-smarter-than-you-because-I-agree-with [insert your favorite New Atheist or equivalent]; loud proclamations about following reason and evidence wherever they may lead, accompanied by a degree of groupthink and unwillingness to change one’s mind that is trumped only by religious fundamentalists; and, lately, a willingness to engage in public shaming and other vicious social networking practices any time someone says something that doesn’t fit our own opinions, all the while of course claiming to protect “free speech” at all costs.
I will certainly miss both his insights, his ability to take other skeptics to task, and his deep understanding of the power and limitations of science.
Listen to this debate with Michael Shermer, for instance. He skillfully tears down the his opponents' arguments.