Yes, that is required in the world by all people, to behave and act civilly towards each other... it's just that it does feel fake because of the PTSD.

What I have learned is the miserable feelings I have are from the PTSD and the times when I am trying to fit in, those are the real me and feelings... some how the PTSD turns things upside down in that. It can have me thinking that I am really the miserable person when no one is around, and only pretending to be nice otherwise. But that's just not so!