I think it's slightly ironic that you present the "know it all" complex as trait that hackers suffer from, given that the OP refers to a post made by a designer

I think it's slightly ironic that you present the "know it all" complex as trait that hackers suffer from, given that the OP refers to a post made by a designer that is a prime example of such behavior. This trait is far from unique amongst hackers, and neither are the negative reactions to it.