As near as I can tell, this is referring to a minor scandal in what I usually think of as the skeptic community.

Long story short, Dawkins made some comments regarded as regressive which got him dis-invited from a couple of skeptical conferences.

It is a slightly different argument than the one we're having now, although it wouldn't surprise me if the sides people take are similar: given that in any large gathering of people (eg, a skeptical conference, an online forum, a corporation, a political party...) there will be some people whose behavior, actions, or speech is hostile, harming, or threatening to some other people, should we force some people to restrict their behavior or leave, or force other people to either accept it or leave?

Unsurprisingly, a majority of the skeptical community opted towards restriction, many skeptical conventions reiterated their policies with the goal of making convention-goers feel safe and welcome, and some individuals who prominently made statements against these changes were dis-invited (as speakers) from some conventions.