It is a learning disorder. Where dyslexia is a visual processing issue, Auditory Processesing disorder is cross wires in the brian with listening. My neigbors daughter has this and to be around her you would think she was rude or not paying attention, or a little bratty or obnoxious (although I'm sur eit affects others in different ways).
She doesn't "get" verbal cues. Like if she comes to the door and wants to play with my daughter, and I say "Jane is eating her dinner" She doesn't "process" in her brain that that meant "You can't come in now, come back later because she is eating dinner" She looks at me like "yeah?" and can I come in and play?" If I then say "It's not a good time" she still doesn't get it. She has actually pushed past me to come in not understanding that I was telling her to go away. In order for her to "get it" you have to pretty much look her in the eye and say very directly and bluntly something like "No, she can not play now, you need to go home and she will call you when she is done". It took me a while to be able to do this, because I felt I was being rude, but there is no other way for her to understand. She doesn't hear "no" unless you actually say NO. She doesn't process the auditory references . She has difficulty in school and her peers tend to see her as immature or odd, so she tends to play with younger kids. (ALthough she is a very severe case, so I'm sure other son't suffer as badly)
She also goofs up meanings of words or attaches a definition that does not apply. For instance, she is very bubbly and talkative, and someone must have called her obnoxious once. She then defined obnoxious as "bubbly and talkative" So one day she in introduced to a parent and her mother said "do you know Miss B.'s daughter Kelly??" and she said "yeah, I know her, she is really obnoxious!" with a smile on her face and to her mothers horror. It wasn't until later when her mother was reeming her for what she said, that it came out that she didn't understand the definition correctly.