It can be DID, I have issues with that as well. For me, it is best to wait until I know for sure if a person is laughing or crying to react at all, which is fine and causes no problems. I also have sociopathic tendencies, so there are other things socially I have to work with. I do not know always how one is supposed to act or react to certain things and situations and so I have to watch other people and learn. Granted my reactions can be different depending on how I am feeling and not necessarily who I am right then but what part of me I am. All to say, sometimes it helps to observe others and take mental notes. Or just wait to react until you know for sure