It's not related to liberal or left logically, but it is related to the liberal left socially, because these SJW movements mostly arose from the liberal left (specifically, IMHO, from the part that somehow lost track of the scope of real problems - kind of ironic, since it means they're generally a pretty "privileged" bunch themselves!).

As someone who considers himself to be liberal left, I'm annoyed by that but I do feel that it's fair to point it out. We shouldn't just bury our head in the sand in the face of an inconvenient reality.

But yes, let's please point out again and again that large parts of the SJW movements have lost track of what being liberal and left is all about, even if that's where they originally started out from.