In what ways does Shawn in Stuck in Neutral misunderstand the world around him?

I don't think that Shawn misunderstands the world; in fact, I believe that he might be the only one who truly understands it.
Shawn is a fully cognitive and mentally capable 14-year-old boy who lives a much more complicated and challenging life than other kids his age because he has cerebral palsy. His family tries to accommodate their lives around him, though his father cannot accept or deal with his condition. Shawn might be immobile and nonverbal, but he is very intelligent and insightful and has a great sense of humor. He has a very complex personality and he wants his family to see beyond his disability and understand that he is no different than others; he, like everyone, wants to live and enjoy life, despite his disease.
Maybe he misunderstands people's kindness in the sense that he expects them to acknowledge him and his disability but also realize that they shouldn't treat him differently because of it. So, perhaps he misunderstands life because he looks at it through the perspective of an innocent 14-year-old kid who just wants to belong. In this way, his misunderstanding is okay, because it proves that his thoughts and emotions are just as relevant as the thoughts and emotions of others.