People talk about right and wrong answers, but almost no-one talks about how people's approach to correctness change as they mature But psychologists have studied this extensively. The Perry Model is the Midwit meme applied to right and wrong Perry (1968) explained why some students will go with the flow when you teach them why one design is better than others, while others will get upset He says that students mature through four stages Duality: Knowledge can be divided into right and wrong statements, with little to no room for ambiguity and shades of gray. Students in this phase see education as accumulate "right" facts Multiplicity: Students see no clear right answer, and so instead view knowledge as a matter of opinions. They may get frustrated if their opinion is seen as wrong. Relativism: Students still see knowledge as having many perspectives, but accept that opinions/stances can have pros and cons Commitment: Learners commit to one stance over the others, but have a nuanced and informed opinion. So if you tell someone their work has a flaw, and they get angry at you for thinking it can be judged, it's possible that you're over your head, or mistaken. But it's also possible that you've just given accurate feedback to someone not ready to hear it.