If you don't like somebody's idea, post a comment about it.
Yeah. Good posts getting disregarded because someone feels entitled to just "rate it down" without explaining why he doesn't agree is the crappiest idea ever. Not to mention the majority of people are not capable of objective thought and will rate down based on petty reasons (as in they don't agree with what was said). Thus unpopular opinions are "bad" opinions regardless of how valid and well thought-out they are.