Criticisms of the rationalist movement
The Neoreaction movement, is a notoriously adjacent idea to the community. Whist it has being explicitly refuted by figures such as Eliezer and Scott, is often actively related by critics.
Main: Roko's basilisk
The Roko's basilisk thought experiment was notorious in that it required specific preconditions available nearly exclusively within the Less Wrong community that rendered the the reader vulnerable to this 'memetic hazard'. As such it has drawn derision from critics who feel perception risk from unfriendly AI is overstated within the community.