So here's how it looks from the other side:

A 'high' (just not a new one) reputation user (not necessarily a moderator) opens a review queue. He sees a new question. He searches the SO if a similar question has been asked. He finds a similar question, and without reading and testing it thoroughly, he marks yours as a duplicate of that.

Now, you couldn't be bothered writing a comment about how the the duplicate flag is wrong, but another user who already spent some time cleaning up the site is supposed to thoroughly analyze both questions to begin with?

People on Stack Exchange tend to try to not be emotional like you, so they don't fight a battle with you. You just resign from a discussion, and then complain how a mistake has been made, that you didn't care to even point out.