The explanation I gave for the flag in the flagging dialog was:
New user who just copied an earlier answer verbatim (and trimmed out a few words). This is the third time I've seen this kind of thing happening... wtf?
To my surprise, the flag was declined with the following message:
Trivial answers are often similar. If you have some good evidence (such as unusual format or variable names) then please flag with specifics or post on Meta. Otherwise, just downvote and move on.
This looks like a template reason, but searching for the response above on Google or on Meta doesn't throw up any other occurrences of this decline reason. I'm also perplexed by why a mod would've given this response when I have mentioned in the flagging reason that the answer (of several sentences and a code block) was copied verbatim.
Anyway, since there's no way that I can give more specifics than I already gave, I figured I'd take the other course of action offered and post on Meta.
I'd appreciate if somebody could
Either confirm (as I think is the case) that I was right to flag the post and that declining the flag was a mistake, or else provide some explanation of what was wrong with the flag.
Take appropriate action upon the offending post.