This is a classic perceptual bias. Everyone feels like HN is full of whatever they identify against, because those are the things we notice the most. Since you identify against "the valley ecosystem", HN seems full of uncritical adoration for it. It's a mirror of your own preferences.
There's also the enormous home-team advantage that anything "anti" has in the human brain, which gives rise to all the snark, cynicism, and rage-fests that take over online communities by default.