Say person A and person B are having a discussion/argument.
Person A tells person B that his views are arrogant, or closed-minded, or some other derogatory adjective.
But in fact it is person A's views that are arrogant, closed-minded, etc. Person B's views are usually the exact opposite of what person A is accusing him of.
This sort of situation happens a lot when discussing politics or religion, for example.
What do you call person A, for calling person B something that he himself is?
I guess, for the most part, person A doesn't actually realize that he is the one that the adjective applies to, and not person B. Maybe there is a different name if person A knows the adjective also applies to him.