Understanding body language, things like facial expressions and tone of voice are important for social interactions. But many of us Aspies are just not very good at those type things. To us, it is a strange and mysterious thing so we often tend to misinterpret what is actually being communicated.
Without recognizing these things our response to some conversations seems inappropriate. We generally take many things literally and based on the facts in front of us instead of as they may be intended.
Of course, I have a more difficult time of tone of language than most Aspies since I don’t hear any tone. Being deaf makes that impossible and that is compounded when I am reading sign language as my primary input. While signing most often gets the basic point across, it just doesn’t help with nuances at all. One sign can often mean many different things and it is up to each of us to discern which meaning is the most appropriate for a given thought. That alone makes for some confusing dialogs. Put together it makes some social interactions almost impossible.