If there are more than one comments that should be removed, don't flag them individually because that can make it difficult to see what's what. When viewing a post, moderators see an overlay with the flags on that post. If there are multiple flags, the overlay can obscure the post itself. Instead, flag the post and leave a custom message explaining which comments can be removed and why.
That seems very inconvenient for the flagger, especially if there are a lot of comments. If the above is only personal preference, shouldn't it be marked as such, rather than as part of the guideline in the post?