How my other autistics experience this. You go into a room full of people and your brain gets overload with all the information thats coming into it. You stay as long as you have too/can then later all of this processing of that information comes flooding to the for front of your mind and then you starting seeing the associations between the information you just picked up and everything else you know? As a consequence you develop a phobia about going into similar situations as you know the toll it can take and the pointless wasted but obsessive thinking that will go into processing what is essentially nonsense.