It's what people do when you tell them: Look I have an algorithm that can do your job. It's the first thing you learn not to do when working in machine learning. For example I was working in Digital Pathology, no Pathologist will ever believe you when you say an algorithm can do their job better (maybe there are some exceptions). Even if you show them that they never agree on anything, not even with themselves from last week, they keep believing they are the correct one. It's human I guess.