I'm going to hazard a guess here since you mentioned vaccines. Was your comment something along the lines of vaccines causing autism or some other problem, that

I'm going to hazard a guess here since you mentioned vaccines. Was your comment something along the lines of vaccines causing autism or some other problem, that hasn't been scientifically proven? I've seen several examples of anti-vaccine comments being downvoted. Here's an example of a vaccine thread where numerous comments have been downvoted: http://news.ycombinator.com/item?id=2182852 http://news.ycombinator.com/item?id=2182852 If your comment went against a generally accepted viewpoint and you tried to use links to pseudoscientific sources to back it up, then yes, you'd run afoul of most people here and be downvoted. The bad science surrounding this issue is a particular pet peeve of many people. You say "I posted links proving my point" which leads me to believe that maybe you're very set in a viewpoint that most people don't find credible. Of course, since I don't know what your original comment was, this is all speculation.