Prosody

       Poor or inaccurate prosody in speech is also a common Autistic characteristic. Many times our tone of voice doesn't match what were trying to say. I mentioned before how I tend to be shocked when hearing recordings of my own voice. This may all sound petty but it can cause some serious misunderstandings. Poor prosody can make someone sound serious when joking or vice-versa. It can cause someone to sound rude, pedantic, insincere, or angry when they are not. Prosody is also important when using sarcasm or irony as it can cause someone to be taken literally when it wasn't intended. This may be even more noticeable when one is dealing with strangers or new acquaintances as they don't know a person's baseline personality and mannerisms. The following link briefly touches on the topic and there is a lot of other information on prosody in Autistic individuals elsewhere on the Internet.