well there's some maniac who is downvoting my post, don't he/she owe an explanation to me
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Two downvotes are not the end of the world, and no, they don't owe you an explanation. If it is not obvious why the question or answer is bad, it is nice to explain the downvote, but it is not required.
If somebody is serial downvoting you the downvotes will be remove automatically, but 2 downvotes are probably not enough to trigger this.
Have to agree that there were some very odd voting patterns going on in the JSON object repeats in PHP output question - there were effectively three identical answers out of four and all but one of the four were downvoted without explanation.
No it doesn't require.... orange box appears for member with less than 2000 reputation every time but nothing is forcing the member to add comment.
This is free community so I guess such things can't be avoided without harming the "core" of the community.
Know it's easy to say but it's not a big deal... that person can cast one downvote every time removing 2 rep points, while it cost him 1 point - not pleasant but IMO not the end of the world. :)