Suppose you are sending out invitations to a graduation party. You know that one of your close friends is going to be out of town that weekend. Aspie logic: "There is no reason to send them an invitation, since I already know they can't go. In fact, sending them an invitation might make them feel bad." If your friend is an NT, it's the wrong answer. They want to know they are wanted. Plus, it's always possible their travel plans will get canceled.

There's also a difference between Ask and Guess cultures in this kind of things.