alt Hacker NewsI agree with your sentiment, but to answer your question: Since forever. (At least I know examples in the 90's).
In the old days of comp.lang.lisp, there were certain individuals who would really get off on denigrating people who wrote code that was not up to their ivory tower level. Some people left because of it. Others took it as a badge of honor falsely believing that the dressing down was necessary for them to improve their coding skills.
Example of an old discussion on HN about it: