I had to reply when I saw this of what you wrote: "... people with low emotional IQ simply assign their own motives and feelings onto others because they aren't clever enough to imagine that other people can have thoughts and feelings that they don't have." <--absolutely.

"I finally understand another problem at college where she kept arguing with a professor that his quiz questions had meanings only she could understand. She hears what she thinks you are saying instead of what you really said. ... serious brain damage from an accident."

I had the misfortune to work under the iron grip of a woman who had both of these problems. I had several years to observe her and her behaviors were so outside anything I had ever experienced in my many years of working with many different types of people--I had to do some research to understand.

She had difficulty speaking--literally with forming words--and it became apparent that she also had trouble understanding the meanings of the words being spoken to her in context with whatever the situation was. She avoided written communication, too--and what little I saw from her was mostly incomplete sentences. From what she said over the years, her problems were lifelong; not as the result of a stroke in her adulthood. She mentioned once she had had speech therapy as a child. She was often deeply offended by other people and would go into rages when she thought she was slighted.

One thing though I would say about 'interrupting in classes'. Years ago at a college I attended we were encouraged to speak freely without raising our hands. When I went back to the same school many years later and did that, I realized quite quickly that things had changed and not only did students not speak out like that, overall they didn't offer anything unless they were sure their comments were somehow 'correct' and what the instructor wanted. So the people you describe could have a condition--if you are sure they know what the expected way of communicating in class. When you said "adult" I didn't know if you meant young adult of the same age and experience as the other students -- or if you maybe meant an older adult who has come back to the classroom after many years away.