On my account on SO, I have only cast six downvotes. Every time I cast a downvote on something that was at 0, taking it to -1, almost immediately it was upvoted by someone else back to 0.
Should I assume that these downvotes were inappropriate, or is that taking it way too personally? Are there people who just run around upvoting all of the -1's they see that they disagree with? Are people more likely to upvote a -1 than they are to upvote a 0?