pretty much. But I think it is one of those concepts that mean different things. For you common courtesy is answering an email. When I'm in that place for me common courtesy is not bothering me in the first place. I don't mean that to sound snarky -- just to point out my brain is in a different place than my supporters.
And yep - I talk to strangers and friends just fine. Because it's easy to keep a facade up for the few minutes (or sometimes hours) I'm around them. They don't want anything from me. They don't want to talk about a relationship, or whine that I'm not giving them the attention they need, or try to discuss why I'm in such a mood. They just want to bs with me about surface stuff.
Relationships have to go on the back burner until my brain stops screaming. I have to get away from anything that makes the noise worse. That includes people who love me - because after a while all I hear is waawaaawaa... When I'm isolated I'm a different person. Period. That's. Why. I. Isolate. Because I'm not me. I'm me under fire - and that makes me think and behave differently. The last thing I need is someone bugging me about our love life.
For me common courtesy means leaving me alone until I can settle back down.