I’m quoted in this, which does about as good a job overviewing the topic as a New York Times profile can be expected to.

Major oversights in it as I see.

First, It does not acknowledge the fact that Yudkowsky is, at heart, a complete crank. This remains, to my mind, crucial to understanding the rationalist community’s influence on the world: they’re sci-fi writers being mistaken for scientists.

You can’t really understand the harmful effects of SSC until you realize that it’s part of a larger movement of bullshit artists serving as cult leaders to the techbros.

Second, and more importantly, it never really explains the harm that’s being done by Scott Siskind and his followers. It comes close, noting that “SJWs” were the only group not welcome in SSC, but it doesn’t capture the harm of that because it doesn’t unpack the term.

What is meant in practice when “SJWs” aren’t welcome in a space is that marginalized people speaking of the harm they experience are silenced.

That’s it. That’s the meaning.