To be fair, this is something built into the average humanity. If we have learned something from young, it takes very much to change this belief. It can be anyt

To be fair, this is something built into the average humanity. If we have learned something from young, it takes very much to change this belief. It can be anything from what is the best programming language to politics, religion or whatever. For discussions with the opposite belief, it easily goes into - "He has been brainwashed" - land. It's very hard to convince someone that they have been wrong their whole life, especially if there has been loads of studies supporting that case.