How so? It's a book about someone who doesn't fit in because he doesn't follow the societal norms. Because he doesn't fit in, they assume he's an outsider and treat him with contempt.

I just read the book and it had an author's note. Camus stated that the main character simply didn't lie. He never lies in the book. People ask him how feels and he always tells them the truth, even if the truth makes him look emotionless or selfish.