Do you have any specific threads to point to where you're experiencing this? I actually find that a lot of my comments get upvoted when they're out-of-line with the majority, but provide good counter-arguments. (I find that in-line-with-majority comments get overlooked.) So, if you'd share some examples, that'd really help for backing/refuting your conjecture.

Looking at the threads you've been downvoted for (http://news.ycombinator.com/threads?id=Maven911), I'd say you feel this way out of spite but the downvotes are reasonable given your comments are neither insightful nor are they informative - merely speculative with a side of passive-aggressive and needless sarcasm.