In my experiences as a person with autism, I have found that there are certain areas and situations that strike me as certain archetypes. No matter the particular nuances of the situation, they ultimately fall into one of these three: The Stronghold, the Throne Room, and the Wilderness.
Everyone, no matter if they are on the autism spectrum or not, has a stronghold: a place where they go to retreat, to get away from all of their troubles and undo their stress for a time. For an autist, however, this stronghold is of even more importance. The world around them has so much more stress than a neurotypical's world, and a place where they have total control of their
The Throne Room is an area where an autist feels comfortable. This area need not be a particular physical location, but it usually is. The important thing, however, is that there is an air of acceptance; that they will not be ridiculed or shunned for expressing themselves. A throne room could then be a particular group of friends, or a topic of conversation that the autist has expertise in.
Finally, there is the wilderness; an alien land, both fascinating and frightening. Neurotypicals can experience the wilderness as well, but for an autist, it is a matter of everyday life; the sensory overstimulation can be maddening at times. Keep this in mind when you talk to an autist; they may not be consciously ignoring you, but simply trying to make sense of the world around them.
Hopefully knowing more about how the environments are seem to us will help neurotypicals understand how to approach conversations, which will, in the end, help everyone coexist in relative harmony.