I still don't get that quite lol but I read his book The Trouble With Being Born (because if your signature iirc), I dont read much but I loved most of what I understood. It fits will with this thread, and I'd recommend it as a dark read!!
If no one has answered yet, here is my interpretation of the qoute.
Humans are essentially animals. We,eat sleep, poo, and do the "grown folks" just like every other mammal.
Monkeys (apes, bonnobo) or one of those we are related to or share common ancestry or something. I'm not well versed in human evolution but i think you get the picture.
Those who don't follow the pack are not acting very animal (monkey) like, they are concerned with more than eating and satisfying primitive urges. Once the pack notices you aren't conforming as expected, you run the risk of shaking up there whole illusion.
EMC is saying, if you can't maintain enough of the animal like behavior that society expects of you, you'd do best to keep your ass in the house. If not you'll be shunned (ignored), mistreated (bullied), or deemed insane and get locked away in a psych ward.