While it is easy to fall into this trap of disagree downvotes, they should really not be used that way. All that does is turn them into a popularity contest. Downvotes should be used on comments that do not improve the thread. This may be because they are wrong, made in bad faith, rude, or otherwise, but not simply because you disagree. Ideally we would have different buttons for this like the forums of old, but no one seems interested in that nowadays.