Amber and john had an argument over whose turn it was to do the dishes. in the heat of the argument, john calls amber a "slob" and she calls john a "self-centered moron." later, after they have made up, john tries to apologize to amber and to explain that he doesn't really think she's a slob. amber is still hurt and complains that no matter what john says now, he must have meant what he said. which principle of interpersonal communication is john experiencing?

The correct answer is that communication is irreversible.

In the given situation, Amber is still hurt due to the things that John had said unto her, especially calling her a "slob". Though they already made up, Amber still feels upset, because she thinks that what John has said is true. John is experiencing the irreversible aspect of communication, wherein communication cannot be taken back, whatever you might have said, will stay that way. It cannot be changed nor taken back.