It's a rule to not asking for a reason of downvote, because everyone already encouraged to write a reason of a downvote and when he/she don't want to write the reason, asking again about downvote is totally obsolete. In fact w.h.p downvoter wont be care about the comment and wont provide any helpful information in future.
I marked this comment as obsolete:
no one tried to understand what I'm saying, but I've got 2 downvoting votes, it's really a pitty, at least one user downvoted me without taking in consideration to explain the reason that maid him do so.
Moderator rejected the flag. I'll be happy to know that according to which rule or interpretation of rules or comment my flag is invalid? Also if moderator made mistake he can fix it.
P.S1: I'm personally against downvoting without commenting but that doesn't mean I expect everyone to be like me in this case, I just can encourage to comment and I think this also holds for moderators.
P.S2: I already tagged this as moderation not moderator but in the text I used moderator, because I didn't find a better word to describe the situation, but it is possible that flag being rejected by some users which are not moderators but they have access to flags. So here I have to clear that the audiences of aforementioned situation are not just moderators but everyone who has access to some moderation tools. May be my thought are wrong but we can share our opinions.