I recently flagged an answer with a custom flag saying:
Comments are obsolete now
I flagged the answer rather than each individual comment because several times on MSE and MSO I've seen that advice, for instance here and here. It's even on the flagging page:
If you see a post where many comments should be deleted, especially if there's an ongoing discussion, there’s no need to flag each comment. Flag the post for moderator attention, and use the “other” reason explain what's going on.
The flag was marked helpful but with this note from the mod:
This was a valid flag, but next time please just flag the offending comment or comments directly instead of using a custom flag.
Am I missing something? Do we flag individual comments (in this case I think there were five or six), or the post as a whole? I was a bit surprised to see I hadn't put "All the" at the beginning of my flag ("All the comments are obsolete now"), but the mod seemed to get it as they were all cleaned up. Was it just a missing "all"? Or a new mod not familiar with this convention?