Endermen don't make idle sounds.
The endermans do not sound when spawning
Enderman does not sound when generated
Enderman does not sound when he gets angry because the player looks him in the eye
Enderman does not make sound when he gets angry by the player seeing him in the eyes
Enderman does not sound when generated only by attacking it
Enderman does not sound when he gets angry for the player who sees him in the eyes
Enderman doesnt have neutral sounds
Baby mobs no longer make idle sounds.
Ocelot Cats Don't Purr