I stopped participating because I found that I usually was insulted somehow or my answer was not credited. If they can find any fault in a question or answer they will take the opportunity to do so. If you give a correct answer but don't include a significant amount of explanation, it will be marked down. Often times I see perfectly valid questions and people refuse to answer them but will only respond with a comment…
Same on HN. I assume programmers get hyper pedantic because they spend their time telling a computer exactly what to do... Although I was pedantic anyway, so maybe cause and effect are the reverse.