Downrating an answer without a reason?

How do you feel when someone rates your answer down without making a comment? Does it irritate you or do you not care?

I am asking because I have seen some questions where answers have all received a down-rating without a comment or any obvious reason for the vote. And many of these answers were long, detailed, and helpful, so it didn't make any sense for me for someone to come along and criticize without comment.
Downrating an answer without a reason?
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