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Or enough courage.

Courage alone won't really help to hide it (but it may help to get hidden yourself in future). :)

Good friends wouldn't let you go down alone.
Rare though they may be, they do exist.

Sometimes, actually, good whale friends would be necessary ...

Yes, good whales would be good all the way around.

And the spammer won't downvote you if you mute his comments under the post?

At least the author wouldn't have to see the comment of the spammer anymore.

Furthermore, I think a committee of elected users with some delegated Steem power from Steemit, Inc. might help, which could decide (in case someone complains) if flags are justified or not, and if "yes" just counter them with upvotes.
In addition, accounts who repeatedly misuse flags in an abusive way (instead using them against spam, plagiarism etc.) could be flagged, as well, after a decision of that committee.

!Liquid Courage

Gave it up over the headaches.