Disunderstand (dis-un-der-stand) (verb)

1. Refusal to concede an idea. Unwillingness to acknowledge or attempt to understand a given concept, principle, act, or activity for fear that such understanding or acknowledgement is antithetical to one's own principles.

2. To fail to comprehend or understand why something is the way it is, when it is obvious that the situation should be otherwise or the situation defies logic or common sense. Similar in meaning to misunderstand, however it implies that the speaker blames the source, often a person or group of people, for intentionally causing confusion or simply being too lazy to clarify the situation.